I've compiled TomatoUSB binaries and made them available on the following SF side. They are from Fedor Kozhevnikov's commits without any modifications:
I've heard that the kernel 2.6 MIPS R1 builds will brick routers. So they are not published unless someone can confirm they are safe. The kernel 2.4 versions cannot be compiled cleanly due to code bugs in the recent PPP commit. Only nvram 60k versions are available for the new RT-N head since that new driver is rather big and isn't useful on older routers.
Caveat emptor: I did not test all binaries, only the nvram 60k version so use at your own risk. Will continue to update the binaries when Fedor updates git and when time permits.