SUF  Just a note, this product does not and doesn't seem likely to be supported on Snow Leopard. May I suggest Glims as a direct replacement with broader features and no affiliate links. :)  
(Version 3.2v62)

SUF  Fantastic app. The single problem I have is that Growl notifications only appear if you manually click on a track in iTunes or when iTunes automatically changes. If you use the Apple keyboard media keys to skip a song, Growl notifications do not appear on a track change.

When this is fixed, it would be a solid piece of software. The memory leaks look to have been cleared up and it's 64 bit. Great interface and invisible until needed, as any good app should be.  
(Version 2.2.1)

SUF  Absolutely fantastic piece of software. The Garmin Software that comes with forerunner watches pales in comparison. This is easy to use and gives great insight to workouts.

As an aside, there seems to be a few little bugs to work out but the developer seems to be working non-stop as of late. Keep it up lad, your efforts are appreciated.  
(Version 2.1v410)