AppBrain App Market is just like the stock Market, but on steroids. First of all, you browse and install apps from your computer! Also, this app has a great back up program where if you get a new phone or do a factory reset, you can check on your computer what apps you installed and reinstall them! In the app, you get app recommendations based on what apps you installed. You can also browse Hot Apps, this where I find really useful apps. I definitely recommend AppBrain, especially if you are on Android 1.5, the interface is way better. The Android 1.5 market is flat out ugly.