I for one love the D&D art gallery - hundreds of pictures of characteres, towns, towers, weapons, etc. I love all art along those lines as well - I'm working on a world, and it's great to find a pic that perfectly exemplifies a certain area or person or idea I've had. However, I can't get enough D&D art, and I can't find enough D&D art. I've listed the art sites I know below to get started; here's my request - If you know any sites that have quality fantasy, D&D, or LOTR art on them, then post 'em up! I'm looking for anything that's in a genre I call "realistic fantasy" - cool creatures, weapons, settings, etc, but not any of that kinky, trippy Boris Vallejo stuff. I'm not knocking Boris here, but I'm just not into that. If you want a better idea of what I'm talking about, look at my user pic or at some of the sites. D&D art lovers, flock!
Official D&D Art Gallery - http://wizards.com/default.asp?x=dnd/arch/ag
Elfwood - http://elfwood.lysator.liu.se/
John Howe - http://www.john-howe.com/
Ted Nasmith - http://www.tednasmith.com/
Alan Lee - No official site, but work can be found at TheOneRIng.net - http://fan.theonering.net/rolozo/collection/lee