This is an interesting app. First off, it is a complete time waster. Basically, you indicate what you're interested in - movies, science, history, etc. Then, you start "stumbling," which means the app takes you to completely random websites based on your indicates interests. Some of the sites are great, and you will never encounter them otherwise. You are able to "favorite" sites as well, and have "friends" whose favorite sites you could check out.
Pretty simple: free video calls over the 3G network. No WiFi required.
Really awesome photography app where you are able to take panoramic photos of your surroundings. You are able to view the panoramic photo's in 3D if you have the app, but you can also save them to your images. Not free, but worth it.