Well, I added glibc-2.3.6-r2 to the tree tonight, which I will keyword as ~x86 in the next few days so long as no problems come up. After that, I'll make sure all major apps are compiling fine with gcc-4.0.2-r3 (which they are currently), and then we can finally start getting gcc-4.0 into ~arch. So, if you want to jump the gun and start testing, just unmask the latest glibc and gcc ebuilds. If you find a package that doesn't compile and there isn't a bug open, please create a bug with the error message and the output of `emerge info` (a patch would also be awesome, but not required :) ). Also please set the bug you create to be a blocker of bug #117482.
Well, I think the x86 team is working out well, but we could still use some more arch testers to help out and improve the testing we are doing. If you want to help out with Gentoo and you aren't sure how to start with doing so, this may be a way for you. Just come talk to us on IRC (we don't bite) in #gentoo-x86 on irc.freenode.net. (Yes, this sounds like a bad advertisement, but hey...whatever works :P )