I have been using Camera+here and there for several weeks. Mostly I have used some of the enhancement filters to make a few photos look better on my iPhone 4 before emailing them to someone. A couple days ago I took the photo on the left, not too bad. Then I ran it through the clarity filter in Camera+ to come up with the photo on the right. Much better. It could still be better, but on a 4 megapixel phone camera with a tiny sensor it is not too shabby.
Click to make the photos larger