I sorta debated if this was worth posting about, but I think it is worthy of a mention. I found this app in the Android market the other day after the default camera on my G2 was messing up. After seeing the photos I took with it I got really excited about it. It is due to my odd curiosity on old style photos.
The app is called Retro Camera from Urbian and is found in the Android market. I would not be surprise if it is in the iPhone market also. As of right now (not sure if they plan to update it) they have 5 camera you can use. Here is also examples of the pictures it takes. Just to note, I am not a great photographer .