Canon S5is
What are the differences between Canon PowerShot S2, S3 and S5is cameras?

I've been looking for a digital camera for a while, but I want to make sure that they have a lot of information, since it is an expensive purchase. I have seen several different models, but I keep coming back to the Canon PowerShot line. In particular, S3 and S5 of. I know the idea is to further improve the line, but does anyone know what are the enhancements and additional features of what the S5 can have? Pros and Cons between the two, the experience with the delay time, battery life and such? Any help would be greatly appriciated.

they just keep getting newer and better. basically the same, only better.