I just spent some time looking over PSFoundation and it's a great aggregation of useful classes from all over the place. AND there's some great original code.

I just spent some time looking over PSFoundation and it's a great aggregation of useful classes from all over the place. AND there's some great original code. E.g., PSActionSheet, that let's you assign a block to each button. I hate coding up the action sheet delegate and blocks make this typically ugly thing quite shiny. PSFoundation is definitely worth a look.