For me and my tastes, there's been some pretty damn good releases this year, if you ask me.
My best of 2011 has to be (and some songs from them) :
Unto the Locust - Machine Head (Locust [http://www.youtube.com/watch?v=jxjeqCd6Zm0], Who We Are [http://www.youtube.com/watch?v=2lY2J4KUDAs])
Endgame - Rise Against (Make It Stop [http://www.youtube.com/watch?v=XP4clbHc4Xg&ob=av2e], Satellite [http://www.youtube.com/watch?v=6nQCxwneUwA&ob=av2e], Broken Mirrors [http://www.youtube.com/watch?v=yH5-fZmCWwU])
Let Them Talk - Hugh Laurie (You Don't Know My Mind [http://www.youtube.com/watch?v=WhHdOMYTvAE], Baby Please Make A Change [http://www.youtube.com/watch?v=kN_MLh0HOFQ&feature=related], The Battle of Jericho [http://www.youtube.com/watch?v=F223DEpchq4&feature=related])
Going Out in Style - Dropkick Murphys (Going Out In Style [http://www.youtube.com/watch?v=D7g3RuoreRc&ob=av2e], The Hardest Mile [http://www.youtube.com/watch?v=d4S5wxHmA4Q], Broken Hymns [http://www.youtube.com/watch?v=tHLHdj4DAjw&feature=related])
Sounds of a Playground Fading - In Flames (Deliver Us [http://www.youtube.com/watch?v=KTiQ75HY0DA], Where the Dead Ships Dwell [http://www.youtube.com/watch?v=ylfn0o66jwM&ob=av3e], Enter Tragedy [http://www.youtube.com/watch?v=6xD0RsAvKs0], All For Me [http://www.youtube.com/watch?v=jmq6ykyHGKI&feature=related])
Special Mentions go to these albums, for being great, but not quite as amazing as the ones above.
Flying Tigers - White Wizzard (West LA Nights [http://www.youtube.com/watch?v=KhKpNulB9VA], Fight to the Death [http://www.youtube.com/watch?v=zS7Cl_KBYeU])
In Waves - Trivium (Built to Fall [http://www.youtube.com/watch?v=_XD2jKlCiK0&ob=av2n], In Waves [http://www.youtube.com/watch?v=KxOhc-dfEDY&feature=relmfu])
I Say - Mr B. the Gentleman Rhymer (You Just Can't [http://www.youtube.com/watch?v=SynCx4rfej0], Crazy Knights [http://www.youtube.com/watch?v=Xerj670_XnE], Songs for Acid Edward [http://www.youtube.com/watch?v=Nfjte-ILJJ4])
TH1RT3EN - Megadeth (Public Enemy No. 1 [http://www.youtube.com/watch?v=fLN1OB3_wG8], 13 [http://www.youtube.com/watch?v=P_yl2WuiW4g])
The Hunter - Mastodon (Curl of the Burl [http://www.youtube.com/watch?v=lAihDAJX8Ow&ob=av3e], Black Tongue [http://www.youtube.com/watch?v=hwgqenxNUfs])
Surtur Rising - Amon Amarth (War of the Gods [http://www.youtube.com/watch?v=vD1pPweJ5ws], Slaves of Fear [http://www.youtube.com/watch?v=6oFjHDFVJc0])
Worship Music - Anthrax (Fight 'Em Till You Can't [http://www.youtube.com/watch?v=nzDmgn-G2FM], The Devil You Know [http://www.youtube.com/watch?v=TT76uz21TNg&feature=relmfu])
Super special extra mention goes to my single favourite song from this year, which I heard once, on BBC Radio 2.
Wasted Years - Ryan Adams (Iron Maiden acoustic folk cover) [http://www.youtube.com/watch?v=82SaWx3-gks&feature=BFa&list=FL3lGoSenOUOx-L1YAHVTM7A&lf=mh_lolz]