If you don't have a Kensington Mouse remote but still want to groove around your place without running to your computer every four minutes (because you want to hear that Kanye song again), use your iPhone (or iPod Touch) as a remote control! All you need is WiFi, and the download Signal (the demo is free and all you need to do is this). Then, have iTunes open on your computer.
First, put one hand in the air. Wave it around like you just do not care. With the other hand, point your iPhone browser to the address the demo download gives you — after the first time you go to it, add the web app as an icon to your iPhone home screen or just bookmark it.
From Signal you can browse your entire iTunes library and it will even display the album art on your iPhone or Touch. Party on, geeks!