Act your wage.
It looks like this has been around for a while, but I just found it and I think it's a great add-on to OS X. It's more convenient than the iTunes widget and it's quicker than opening the iTunes window to change tracks. The screenshot below is an example of what it can look like on your menu, but it's highly customizable. Mine is simpler and matches the rest of the bar. Anyhow, give it a try if you've never used it before.