The first feedback and actually a patch for the Cell miner sent to me as a private message: https://github.com/shakt1/cpuminer
But one problem is that shakti is a newly registered user and has no permissions to post anything here yet.

edit: here is his thread in the Newbies section: https://bitcointalk.org/index.php?topic=64222.msg753270#msg753270
If there are more people "on probation" (maybe newcomers from the playstation3 linux community), then it could be a good place for them to post some comments.