Since the release of version 2 of the iPhone OS, developers have been able to write native applications for the iPhone platform, and make them available (free or for a price) in the iTunes App Store. In just nine months, more than a billion apps have been downloaded from the store. As a recent iPhone user, one of the first things I did with the phone was access the App Store and start downloading some applications. After a mere two weeks, I can name at least 10 applications that are so good no iPhone user should ever have to do without them. (…) more after the jump ›