BTW, I realize now this could be read sarcastically. I didn't meant it that way at all. I know from the blog post it took 9 months, but I'm also curious the composition of the team that built it.
There were two full-time devs, two designer-devs (they write code, for example the iPhone app, but also spent lot of time on UI, usability, and design), and two interns for 12 weeks over the summer.