Still playing 3.5 until the end of the campaign (which is imminent). We're trying out C&C right now and might do it for the sequel instead of 3E. Pathfinder is also a possibility -- it'd appeal more to the players than the DM (me).
We use some Pathfinder adventures, but cleave to the 3.5 rules. IMO, Pathfinder made too many unnecessary rule changes, but Paizo publishes some really good stuff.
Dumped 3.x as soon as 4e was out. Dumped 4e for Warhammer Fantasy Roleplay(the new one) - loving it thus far, possible break for a brief 2e game at some point though.
Playing Pathfinder for most of our 'D&D' but I'm playing a lot of other games more often as well. Traveller being the main one. And shadowrun for another but that's kind of tapered off. I also now have a group that's exploring all kinds of other games.