These are helpers and category methods I use for most of my projects. I DO NOT own copyrights to these code and they belong to their respective authors.

UIAlertView+MKBlockAdditions github.com/MugunthKumar/UIKitCategoryAdditions

UIImage+Retina4 gist.github.com/3719620

UIView+KNAdditions Extracted from Three20 libraries

Helpers.h Collected from various answers from Three20