Just put beryl on the main family computer last night. It's great. The window switcher alone is worth the 10 minutes (if that) it took me to download and install. For those of you who are also running Linux Mint, the instructions for installing beryl are here. It was easy and quick- just copy and paste. I believe the method for installing on ubuntu is exactly the same.
If you decide to try beryl (and I highly recommend you do,) after you install and open the beryl-manager, hold down ctrl and alt and then right-click and move your mouse. You'll be pleased. :)
I'll write more soon about beryl. I'm still experimenting.