What about Yahoo widgets??
I love these things. You can add them on a whim since they don't "install".
They have a million of them for every purpose including games. They can always sit "on top" of all programs so you can always see them (good for stock tickers etc).
Check them out!
http://widgets.yahoo.com
I use a couple of them to control my iTunes.
This one is "iTunes Popup". It shows album artwork, song title, and album name.
The one with the little stars is "mini-rate" which allows you to rate your songs.
You can control where they sit and how large they are.
I also use "itunes shortcut" to control my itunes functions with keyboard shortcuts.
There are so many different ones you will get lost with them.