title: What are some useful TextMate features?
body: <p>I noticed that many people here use <a href="http://macromates.com/" rel="nofollow noreferrer">TextMate</a> for coding on OS X. I've recently started using it, and although I like its minimalistic interface, it makes it harder to stumble upon cool features if you don't know what you're looking for.</p>
  
  <p>So, what feature have you found most helpful for coding (mainly in Python)? Are there any third-party bundles I should know about, besides what's included?</p>