Peggle

http://www.popcap.com/launchpage.php?theGame=peggle

If you have not checked out this game I definitely recommend trying out the demo. I found it to be a great casual game to play if your looking for a break from playing the more serious games i.e. STALKER ,CS , WoW or you just need a quick 15 minute gaming fix (I play it on my breaks at work.)

*Just ignore the unicorn and rainbows though =P