I just loaded Blue Phone Menu on my laptop and had a friend call in. Holy cow is this a cool little app. It made my entire desktop blink on each ring, with a centered popup showing who was calling and what number they were using. I keep missing calls when I'm at my desk listening to music on my headphones so this is a killer app for me.
I also like the actual percentage battery life indicator on my desktop, it's something even my phone doesn't really tell me specifically (there's just a battery icon and estimated standby time left).