File this one under somewhat obvious–but I never noticed it before. The divider between your applications and your documents on your dock can act as a resizer.
Very useful for changing the size of your dock on the fly without venturing in to System Preferences.
There’s a short video below demonstrating this. If you can’t see the video–you may have to click through to the site. Still experimenting with the best way to embed videos.

nahkiainen
Brad Jasper
It was one of those features I didn't remember on Tiger. Nonetheless a beginner tip every now and then never hurt anyone :). March 18th, 2008 at 6:46 pm