Doh - forgot about Ravenloft, Planescape, Dark Sun, and others
Cool - lots of mods going there! A home-baked world is always nice, of course - lots of freedom there, if anything (plus, DC is a way to get people interested in your homebaked world

)
As for Spelljammer - well, it is impossible now, since my Spelljammer boxed set is on the other side of the world in NJ right now (can't find an online copy). Might be implausible anyway, once I go and read over the boxed set again...