Amnesty Generator allows you to create Mac Widgets and Vista Gadgets for your Dashboard / Sidebar based on gadgets that you find out on the web. It can create them from Google Gadgets, widgets on MySpace pages, RSS feeds, youTube videos, pretty much anywhere. You point it to what you want and it then creates the Widget (Mac) or Gadget (Vista) for you without you having to do any programming.

The have a version that created Mac widgets: http://www.amnestywidgets.com/GeneratorMac.html

And they have a version that creates Gadgets for Vista: http://www.amnestywidgets.com/GeneratorWin.html