Apps Gone Free is a very easy way to discover new apps. The interface is very user friendly, and its very simple to go from this app to the App Store to actually download and install the app. My only suggestions would be:
a) It would be nice if there was a way to search or browse by category or something similar. Browsing by each date is a little tedious when you're looking for a specific kind of app
b) I found several cases (mostly in the apps featured further back) where the Apps Gone Free information stated that the app was indeed still free (wasn't marked as Expired as some of the others) but then when I went over to the App store, the app was not free. I'm sure this information is ever changing, so its hard to keep it up to date, but.....
Overall though, Apps Gone Free is useful and something that I see myself taking advantage of in the future.