What alternate fantasy game systems are you trying out if you don't like 4e?
Well, 4e didn't have any effect on my gaming, but I looked at several systems when I was growing dissatisfied with 3e:
TSR D&D and retro-clones (pretty much all of them)
Castles & Crusades
Lejendary Adventure
Savage Worlds
True20
My picks from the above list are:
Original D&D (or Swords & Wizardry)
AD&D 1e (or OSRIC)
I also like both C&C and LA, but neither stuck. C&C because I'd rather run D&D, and LA because...well, I don't know why, actually. I think LA is a pretty nice system, but I guess I don't have time to devote to more than one major fantasy RPG, these days.
Other fantasy games I like include:
Stormbringer (Chaosium)
RQ2
Basic Role Playing
RM2 or Rolemaster Classic
For non-fantasy, I like BRP Call of Cthulhu (and Delta Green) and Classic Traveller. I've also been looking at Trail of Cthulhu, and am very intrigued -- I think it would work well for an investigation "peel the layers off the onion" kind of game. Oh, and I think that Risus is pretty nifty.