yes the superoneclick works great. i have a mytouch 3g running 2.2.1 and it worked like a charm. i then installed the pay edition of root explorer. awesome.
i was able to completely mod my android files. a word of caution... there are not clear dependencies on the factory apps. i had a very unstable system with some unusable apps. however... downloaded alternate free apps from the market, and all is well.