BEN42  p.s. Synergy seems to provide pretty much the same functionality (minus the StepBack, plus some additional flexibility) for the same price and doesn't have any bugs that are immediately available.  
(Version 2.2.1)

BEN42  Very useful program, but there's a bug -- it seems to hang for a minute or two after I quit iTunes. That is, if the menu extra is enabled and set to disappear when iTunes is off, it stays on after quitting iTunes for a while. And if I quit iTunes and then restart it immediately, iMote doesn't work at first and and then after a similar length of time starts working. (It works fine as long as I just leave iTunes on all day.) I emailed support and got no response.

I'm running 10.4.11 on a PPC and iTunes 7.5.  
(Version 2.2.1)