I really enjoy BucaneerBass, an Iron Kingdoms setting fansite ( Privateer Press setting ), with a clean layout featuring; adventures, equipment, NPC's ( and other d20 crunch etc.. ) , maps, contests, art, setting glossary/encyclopedia & more.
This actually brings up a question I've been pondering. Should fans be able to submit their fave sites? Or do the site maintainers/creators have to do the honours?