The videos show a  great app/experience.  I love the idea.  I tried running it on my machine.. all it really did was "REALLY" slow down my computer a lot.  I eventually killed the browser it was in.  So with Vista RC2, 1G ram, roughly 500-600KB/sec internet download speed, Radeon 7500 AGP 64Meg DDR.. and P4 1.6G CPU and an Asrock P4VM800 motherboard... that was my experience.