Hi,
I have put a new SDK for experimental online at
http://nbd.vd-s.ath.cx/openwrt/OpenWrt- … -1.tar.bz2
It is built out of the latest experimental CVS repository.
If you're thinking about packaging stuff for OpenWrt, please give it a try.
It's essentially a stripped-down version of the buildroot with a precompiled toolchain and libraries.
You just put your experimental package dir in there, run make and it will build the stuff.
Have fun!