Re:Going from 1st to 4th editions - what to expect (Score 1)

I'd recommend Castles & Crusades, a sort of stripped down version of the d20 SRD into something resembling first or second edition. Nicely streamlined with a unified rules mechanic. Gary Gygax was developing his old Castle Greyhawk dungeons into the 'Castle Zagyg' productline for C&C. Even though he's passed on, he'd written heaps of notes for it and the first boxed set should come out sometime this year. I've had great success teaching C&C to casual gamers who easily get bogged down by too many rules, but there's also enough substance there to occupy other gamer types, too.