http://www.apple.com/mac/app-store/

"With the Mac App Store, getting the apps you want on your Mac has never been easier. No more boxes, no more disks, no more time-consuming installation. Click once to download and install any app on your Mac. The Mac App Store is now available as a software update for any Mac running Mac OS X Snow Leopard."

I have to wait until I get home to check it out, darn it!