Absolutely nothing new has been published for 3.x since the first 4th Ed books were published.
As for Paizo's success with Pathfinder... Well, WoTC didn't really fix anything important in 4th. They fixed some flavor, and the fixed the whole HD vs level adjustment thing, and they ... changed the combat system. And by changed, I mean they streamlined parts of it, and added about 10 options for each class now. So now it's smoother, but newer/inexperience players will probably bog the sessions down *even* more. Pathfinder does streamline a lot of combat issues, while kinda ignoring the HD vs Level Adj issue (namely because the core classes are just much more powerful).
Either way, Neither is a good solution to the problems 3.0 and 3.5 had. (aka, I'd *love* to play pathfinder if they'd convert 70% of the existing 3.5 stuff, because I'm not going to!)
Which is why I am personally loving the Dresden Files RPG. It's a very good balance between story telling and conflict (including combat). It's also very very flexible, while being limiting enough to not bog down people. And the rules are very simple, with some very complex applications that you can pretty much just ignore if you want.
