HEFF This capability is already built into Tiger. All you have to do it open terminal, type and run this command "defaults write com.apple.dashboard devmode YES", and then log off and back into Tiger. To move widgets from the dashboard, just click and hold the widget, hit F12 to go back to the desktop, and then release. The widget now appears on your desktop. To move it back, reverse the steps.
(Version 1.1.1)