PMRoundImage is a project mainly written in Objective-C, it's free.
A simple class for rounding UIImageViews
This is a simple class which rounds image corners. Just image corners :) The usage is simple:
[PMRoundImage roundImageCorners:imagetest withQuantity:2.2];
Where "imagetest" is an UIImageView and "2.2" is the round quantity.
DON'T FORGET TO ADD QUARTZCORE.FRAMEWORK TO YOUR PROJECT!