It is useless and wastage of time to unbann the banned domains because if it is banned then it will on the Google's banned list and you can't register on Adsense again from banned domain!
Pretty stupid if you ask me. I had one banned because some reviewer mistook it for adult. I appealed and it was unbanned. Just read Google's TOS in the first place and don't get banned.
I agree with timallard, Iv watched these sites flounder before. Sometimes it works - but I suspect that they keep close watch and expect much better or completely different behaviour from the site since it "switched owners". Great post though!