Last night, as I was searching for the "Iridium Flares" app, I found a free one similar to it.
It's called "Sputnik!"
I installed it and it looks pretty good.
Will try it out tonight if the weather's good, there's supposed to be a flare at around 22:42 at 84% brightness in my area.
Anyway here's the link to the free version if anyone wants to try it out.
http://itunes.apple.com/us/app/sputnik/id393001070?mt=8