Originally Posted By: drakino
They don't show up in Purchases, but if you see them in the store, they are marked as "Installed" instead of giving me a button to buy them. From what others have figured out, the App Store will scan already installed packages, and if the app and version match what is in the App Store, it will disable the buy button to avoid a potential double purchase.

Odd. I can't find any of the iLife 09 apps on the store. The only iLife apps are the 2011 edition which just came out. I wonder if its a UK vs US difference for store contents.