This has been bugging me for a while, but I’ve just gotten around to doing anything about it. I hate the caps lock key. I never use it and I’m always triggering it by accident. Thankfully, it’s fairly simple to disable. First go into System Preferences and choose “Keyboard & Mouse”.
Now on the “Keyboard” tab, there’s a button in the bottom left that I’d managed to miss entirely, “modifier keys”:
This pops up a little dialog pane that lets you choose the behaviour of the caps lock key.
I chose control, as it’s not entirely useless. In fact, on my macbook, it’s a damned sight more useful than the hobbled control key which has been displaced by an “Fn” button.