The full version of Sailing Clicker for PDAs and Symbian phones is even more impressive. You can actually see what songs/slides are up next etc.
The k700 works pretty well with the Mac - it's also pretty easy to set up as a bluetooth modem for when you're out and about. The only thing that narks me is from the k700 side - it doesn't copy the avatars over from the address book or the postal addresses like the Symbian Sony Ericssons do