This is a quick super tip for anyone who uses Mac OS X stickies in Dashboard. If you find that you want to delete a line of text from a sticky hold down the command key and then press delete (which I think is backspace on a Macbook Pro). This will automatically delete the line of text within your widget.
The tip of Command + Delete also works in other applications by Apple. For example you can quickly delete calenders with this command. Delete desktop items. There are hundreds of ways to delete stuff through this command. Its a little tip that can save you a couple of seconds.