Our sister site AppShopper finally launched a native iPhone and iPad app that offers the same App tracking functionality as the full website.

AppShopper tracks all the major changes to the App store, including new apps, updates and sales. For example, with the right combination of filters you can find every app that has gone from Paid to Free. For a less overwhelming view, you can just view popular changes amongst other AppShopper readers.

You can then add apps to your own personal wishlist to get notified of sales or price changes. The app now lets you maintain that list on the go.

Its what we use to keep track of interesting game sales, and now you can monitor them on your iPhone or iPad. The app is being discussed on the forums.