Nice job! Just shared it with people at my job.

One minor comment: the text in the screenshots is very hard to read without enlarging, and looks blurry at least in iTunes on my mac. I would make the font a little bigger, perhaps like Textastic or even slightly bigger.

Also, the bright green for the comments is a little too... bright.

This is minor stuff but it affects the first impression a perspective customer might have. An easy fix though. =)