Don't really use a bookmark bar, but these are the pages I usually have Firefox start up with:
#1: Nuklear Power [http://www.nuklearpower.com], VGCats [http://www.vgcats.com], Penny Arcade [http://www.penny-arcade.com], or Looking for Group [http://www.lfgcomic.com]. (I usually check them in that cycle.)
#2: The Escapist. I doubt that needs to be linked... (What? Are you going to lynch me for that not being the first?)
#3: WoWWiki [http://www.wowwiki.com/Portal:Main]
#4: Wowhead [http://www.wowhead.com]
#5: Dark Legacy Comics [http://www.darklegacycomics.com/] (Don't ask me why this isn't with the other webcomics.)
#6: The Light Warriors [http://lightwarriors.wowstead.com/], the most awesome and godly guild on the whole (European) Azjol Nerub server of WoW. You should join them.
Gee, I wonder if it's obvious I play WoW...