How do I close a Widget?Edit
Generally, right-clicking on a Widget and choosing the "Close Widget" option will close a Widget. If that doesn't work, see the Closing Widgets page for more things to try.
How do I quickly hide/show all of my Widgets?Edit
You can use Heads Up Display to bring up all of your widgets instantaneously. The default key to bring up Heads Up Display is F8 - hit this, and all your widgets will come to the front of the screen.
You can also configure a widget so that it will only be seen in Heads Up Display. See the Heads Up Display page for more information.
Finally, you may want to look at alternative Level of Window values for your widget.