@wallcraft
As I mentioned somehwere in my Review, the +/- keys are for volume control as far as I could tell. You can listen to mp3 while reading (I haven't tried it yet) so it's good to have direct access to volume.
The four keys on the other side are (top to bottom):
Music
Main Menu
Back (Return)
Delete (doubles as bookmark key in books)
I'm signing off for today...it's already half past two in the morning here...
