Thanks!

I still recommend that everyone learn how memory management works before jumping into ARC. Much of what I do still has to support 4.0. That said, ARC is pretty badass, and I plan on doing a screencast on ARC in the near future.

If you don't understand basic memory management without ARC, you have no chance of ever understanding the weak reference annotations that ARC requires in certain cases (e.g. to avoid retain loops).