I love MP3Tag and I have been very happy with it. I noticed that there are some properties that I can look up like Style, for example, that you cannot view in iTunes. I haven't found an MP3 player that does allow me to create custom fields to view all the properties on my MP3s.
I don't use the comments field very often, however, at all and I would like to be able to move all of the information that is currently in the "Style" field to the "Comment" field (or the "Grouping" field they have on iTunes) so that I can access this information in iTunes. I've tried to find out how to do this by looking through the forums but haven't found anything yet. If anyone can point me in the right direction, I'd appreciate it!