There are hundreds of iPhone applications available on the market, from games through to photo editing and sharing applications, many of which are available through the Apple App Store. It is a well known fact that the 2 megapixel iPhone camera isn't the best phone camera around and even more disappointingly is that it cannot capture video recordings.
Google has introduced Gmail Tasks for the iPhone. A free web based application, tasks helps you keep track things you need to do. Just click and type to add new tasks, set due dates or add notes, and (most satisfyingly) check them off as you're done. It's a simple list that's with you everywhere you go.