"To do this, start by pressing and holding your Dashboard key--F12 or F13 or whatever--until Dashboard appears. Then, you can take your time and look around. Check out your calendar, the weather, or whatever other widgets you've got loaded on your standard dashboard. When you're finished looking just release the key. Dashboard disappears."
This is an awesome tip. Some times I want to glance at my network monitor, or what the date is, and I had to press F12 twice. Now I don't, and its much more fun! :)