This is just really a piece of friendly advice to those planning on transitioning to Jaguar. (everyone) It would be very beneficial to make use of the 20MB of space and the new Backup feature/app of .Mac to prepare yourself. I for one have backed up my Address Book, entire Mail folder, Documents, playlists, bookmarks, and app preferences. This is mainly because I plan on doing a fresh format and install, like any OS install should be done. Hopefully importing the backed up material will be relatively painless.