If you've got any links to sites of this kind lying around, PM a gallery moderator (deadguy, vijil) to have them added to the list.
www.arcipello.com - Surrealist science fiction digital paintings with some cool artistic poetry built into them.
www.conceptart.org This contains pieces by many of the game industry's best, including an entire community of artists and a wealth of tutorials.
www.dchiang.com - this guy designed everything for the new Star Wars films. Has tutorials and a fair swag of neeto art.
www.cardesignnews.com - want to see and learn pro concept art skillz? This is where you go. A car based site, the skillz can be used for anything. I find it really inspirational.
www.dusso.com - some inspirational sci-fi matte art, this guy is the king of the pen tablet.
eschaton art - cool spaceship art, ink mostly.
www.goodbrush.com - a guy who does cool art and stuff
www.polykarbon.com - tutorials, mecha, anime, other stuff...
http://www.teamgt.com/ft-port.htm - more, in case the rest sucked.
www.artbyfeng.com - a chinese sounding dude who draws. Cool.
my very own art, see what you think
- character artist, pretty alright.