I don't remember on which of the three or four retro-RPG blogs I saw this on, but you have to check out Curmudgeons & Dragons, which is a sketchblog of art in the glorious style of '70s-era D&D.
The art has a particular kind of quasi-amateurish (but in fact very well done) style that captures both the imagination and the wistful memories of games gone by.... Steve Zieser goes on my Favorite Artists list now.
Sweet St. Cuthbert, he even illustrated the Limed-Over Skeleton of the Abbot. Now there's a phrase I've not heard in a long time. A long time.