Factotum, out today in the Mac App Store ($3.99), lets you use your Mac’s media keys for online music services like Grooveshark, Pandora, Rdio, Last.fm, and more. Pretty cool, considering iTunes has become too bloated to be practical as your computer’s primary music player.

We’ve got five free copies to give away, so the first five people to comment with their favorite online music service will get them. Be sure to leave some way for us to get in touch with you.