The Mac app store has gone live today. Like with the iphone there will be a mix of free and paid for apps but hopefully with today being the first day most will be free and many more will be added in the near future.
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.