I run three groups intermittently, all 3.5 (w/ Book Of Nine Swords natch). 4th and 5th can burn in hell. Pathfinder is cool though.
I own about ~30 books in the 3.5 system, and a handful of other random core books from other d20 and non-d20 systems. Non-D&D stuff gathers dust.
Must have resources:
I would actually be all for podcast participation, as DM or player, dependent on commitment and system of course.