Here it is, the list of the manga I could recall off the top of my head; pardon the wall of text:
1)
BLAME!: Easily one of the best stories I've ever 'read'. Be wary of some gore in some places. It's set in the future and is full of win. Use your imagination; it'll help.
2)
Otoyomegatari: I love this story; and thoroughly look forward to each chapter released. Set in the late 1800's? (Don't blame me it's late.) It follows a young newly wed wife in what amounts to an arranged marriage: it works out nicely and the story goes along at a nice pace. It's really interesting too, and the freaking artwork! O_O
3)
1/2 prince: Priceless parody.
4)
+Anima: One of my personal favorites. That goat cheese looked sooo good.
5)
Bleach: Whitening. A manga most people either like, or hate; akin to Naruto in popularity, but at least this one explains magical clothe regeneration.
6)
The Ravages of Time: It's slow, but once you get into it, it's actually fairly interesting.
7)
Sketchbook: ^_^ Those little drawings at the start of each chapter would make wonderful bookmarks don't you think? Anyways I like this manga. It's kind of a dry humor approach to life and the various odd quirks therein. More geared to a Japanese populace, but is certainly still enjoyable elsewhere.
8)
The Breaker: Just read it; you'll probably thank me.
9)
The Breaker: New Waves: When you're done reading The Breaker, start reading this one.
10)
Toriko: Hilarious food manga; yes that's right: food manga.
11)
Soul Eater: Mixed opinions on this one; worth at least checking out.
12)
Gantz: Another gore one, read at your own risk. I like the SPOILER?, serious sci fi setting.
13)
Kekkaishi: Um...ya just check it out, I'm actually not really fond of it, but I've already read several hundred chapters so I just keep going. (shrugs)
14)
Nurarihyon No Mago: Ya....I recommend reading at least twenty chapters before you decide on this one. In the end I decided it wasn't for me, but I still follow it regardless.
15)
Claymore: Funky.
16)
Kuroshitsuji: Nice butler manga. Check it out, it could certainly be worth your time.
17)
Break Blade: I do not favor the turn of events in the latest chapters; otherwise...fairly good.
18)
Gamaran: Uh...can't think of anything to say about this one; Hax feudal weapon manga.
19)
Ao No Exorcist: I'm atheistic and I love this manga.
20)
Cage of Eden: Made me go: WTF? Read at your own discretion: it's survival-horror-mystery-whatever.
21)
Bio-mega: if you can handle the gore I suppose; it may be worth your time. I did like it though, just not really all the gore.
22)
Tower of God: ...It's...odd?
23)
Ubel Blatt: I like it. Can be a tad bloody though...has some rape scenes if I recall and of course murder and killing. Ya I like this one though.
24)
ULTIMO: Where is chapter 16?! I recommend this one; nice artwork too. Just read it for a while, you'll catch on. It also helps to remember the 'dolls' are simply advanced automatons(borderline sentient).
25)
Yureka: Weird...could be worth your time to check out; similar setting to 1/2 prince but not as good.
26)
Zombie-Loan: I stopped reading this manga. I did however, favor the artwork and the story itself wasn't too shabby.
27)
Noblesse: I love this humor so much. Vampire manga, don't let that turn you away though, that would be inelegant.
28)
Painting Warriors: Artwork a tad on the rough ink side, but that's not necessarily a bad thing; the story itself could leave one desiring more though.
29)
Spice and Wolf: Has a significant body of pornography, not in the manga mind you(I just happen to be aware of it) The story itself is fairly interesting though...if you like business in an earlier era.
30)
Akaboshi - Ibun Suikoden: The ending seems to simply cut off. Took me a bit to realize that was actually the end; fairly good though.
31)
Azumanga Daioh: Eight years ago I found a lost book of this manga in an unused locked room at my school, piled under boxes. As such it does hold a special place in my mind; the story itself isn't too bad, and their volume is extensive. (Also has a significant pornographic following)
32)
Blade of the Immortal: An interesting take on a few aspects of the human condition. More than a few of the events in this story have made me question whether to simply jump ahead of them. Not for the pure minded/light stomached. There is graphic torture-rape-murder involved; you have been thoroughly warned.
33)
Buster Keel: Come on when's the next chapter coming out? Dragon-ape manga.
34)
Death-Note: I actually do not like this manga and have no intention of reading it. Many people do like it though, and so I decided to include it. That said, I love L's character. The L diet indeed.
35)
Fairy Tail: Full of magical happenings, some parts of the story lag pretty bad by contrast of the high points, and I still have no idea where it's going, but it's good.
36)
FLAGS: An intense game of capture the flag.(not really.) Worth checking out though.
37)
Historys Strongest Disciple Kenichi: This is good; really good; funny too. Magical martial arts manga with super powers bordering on Dragon Ball Z power level. Yabba-dabba-doo!
38)
Jackals: Another good one; full of great big sword wielding goodness. Main character likes throwing around an alligator. ^_^ (Yes there's murder etc.)
39)
Inuyasha: I preferred the anime. Still, can certainly be worth your time; note that the story is completed and is quite large. Set in feudal era demon filled Japan. Bonus: Has the ending you're looking for.
40)
K-ON: Another large pornographic following, this manga could be interesting if you're into teenage bands/school/stuff.
41)
Legend of Tyr: Only recently found this manga myself. I highly recommend it. Steampumk mixed in? How odd. It's good, and I like the artwork.
42)
Immortal Regis: This is how manga are supposed to be made. Great story; Great artwork; Minimal plot holes; a rare find indeed. The story takes place around now, and then you're in an alternate dimension and the fun really starts. (Read this one BEFORE Cavalier of The Abyss)
43)
Cavalier of The Abyss: Sequel to Immortal Regis. Cavalier of The Abyss picks up where Immortal Regis lets off; in that it will make you question whether or not you're reading two completely unrelated manga. Don't worry, the confusion will end soon. I'm still not sure how the author is going to manage having the main character fit his new role, given our knowledge of him in Immortal Regis...will be most interesting. (Read this one AFTER Immortal Regis)
44)
Rurouni Kenshin: A classic that has weathered well. If you're going to get into mangas with swords involved then start here. Great story; nice artwork. (Can you swing your sword so fast it appears as though it's going in nine different directions at once? I didn't think so.)
45)
Full Metal Alchemist: Incidentally you have to say the title of this manga with intensity. I recommend everything. The manga, the movies, the anime. Wonderful. You don't come across stories like this often.
46)
AIKI: Has some funny stuff. It's a fighting manga, with a generally humorous view. Too bad that happened to him at such a young age; I realize what his father was trying to teach him, but I could never forgive anyone for that.
47)
Ghost in the shell: I do not really recommend the manga, so much as the anime and movies. If you're going to watch anime though, then don't miss this one.
48)
Hellsing: This is a really great, BLOOD, BLOOD EVERYWHERE! Ahem, what was I saying? Oh right, I recommend blood with your blood on some bloody blood blood blood, why does two o's make an 'u' sound? wouldn't that be: Blewd? Anyways Hellsing...ya, it's bloody. If you're lazy watch the anime, otherwise I recommend reading it.
Now for a few that aren't technically manga but I decided to include anyways:
http://www.Drowtales.com Check it out, it's a site I've been following for quite a while and I like it. Nice artwork too.
http://www.DresdenCodak.com Another great one; I definitely recommend this.
http://www.Threepanelsoul.com Also see their earlier site: http://www.machall.com Fantastic; enough said.
http://www.casualvillain.com/Unsounded/comic+index Do it. Do it now or you'll regret it.