Thanks mhc and Newt.
@m: Massive Dev sounds good, I'll have to try it I just can't bring myself to buy it. The screen shots look nice but I wanted something a bit simpler and with a bit of a different aesthetic. There's a light meter app ("Photometer") I use that looks like an old style light meter and is really cool, I wanted to try to do something a lit bit retro like that with a nice interval timer.
@Newt: I picked iOS6 as the minimum because it makes it easy to share via Facebook and Twitter (I swap recipes with some friends). I didn't realize so many people use iOS5! Why is iOS6 a no go? (PM?)
Had a request yesterday for Twitter integration. It's done! New version should be out end of next week.