Advanced renaming question-- rename directory based on id3's

is this possible?

I don't think so because AFAIK directories do not contain ID3 information.

However you can rename mp3 files using ID3 information if the mp3's contain it.

You can also move MP3s into directories which are named after ID3 tags by including backslashes in the new name. (Don't forget to double them up if you're using regular expressions.)