Application specific shortcuts i-phone and i-Tunes

i-Photo

command-option-backspace	delete pictures from the library from within an album
command-1,2,3,4,5	rate picture

i-Tunes

command-option-backspace	delete songs from the library from within a playlist
command-B	show browser
command-L	highlight currently playing track
command-shift-R	reveal currently playing track in Finder (was command-R until iTunes 10)