Comment on ByteController

iController does the same but with the added functionality of hotkeys as well as scrolling track & artist info in the menu bar (you can alter the font and colour of text too, to match your menubar)

Hover over the scroll to get the same rew/playpause/fww buttons as bytecontroller but with an added volume button too

iController didn't crash on my friends intel mac (and only uses 5Mb of RAM and 4% CPU when in full use so it's not a memory hog on my PPC G4 laptop), so hopefully it will be fine as an alternative if you can't use byteController (worth a go...).