Deleting an Action

Is it possible to completely delete an action?

I’ve been working on a walk cycle, and then tried setting up some other actions as well. Now I’d like to delete them. So in the action editor, I select the appropriate action in the drop down, and hit the ‘X’ button to unlink it. But it is still there. Worse, all of the actions channels are still in the IPO Curve editor. So when I go to select a curve to edit, I have to open the databrowser because there are too many to display in the drop down.

Can I completely delete the entire action so it doesn’t clutter up everything?