"Odesk and Elance. Only hire people who've worked on multiple projects and have high ratings. There are plenty of talented people out there."

I am on Elance, but can't get any work because I don't have any history. Can't get history without any work. The logic in this is flawed. Interview the people who submit bids, don't automatically rule out people without a history on the site, you might be surprised what they've worked on in the past.

Yeah, and it's not just APIs. Some of the changes are much more subtle, e.g. how often a particular event fires. If you're not careful these can destroy performance in baffling ways.

If you make an effort to stay on top of all the latest OS releases, life is great, but it's frustrating when you're trying to remain backwards compatible and figure out what the heck is going wrong on the new OS.