Tried and approved. These apps have become part of my workflow.
- LaunchBar really does speed things up a lot.
- TextMate: so far, this is the most use I've had out of $50 dollars to date. This app has payed for itself over and over. Plus, it's useful not just for programming, but for writing, XML-RPC posting, and a ridiculous number of other things due to its plugin architecture.
- LittleSnapper Gorgeous utility for taking and managing screenshots.