I know its great to how the ability to edit stuff on the device but if you have a lot to do your far better off doing it on the computer I think. Mp3Tag is what I used to tag and add cover art to over 2000 songs before I put my stuff on the N900 and it realy really helped. It has access to multiple tag databases, it can search cover art or let you add your own, and it does converting from tag to file name or file name to tag. Also I am converting some flac to aac for the N900 and It lets me just copy/paste the tags over making my life so much easier.