Widgetop is a cool new site that allows you to make use of Mac dashboard widgets even if you don't have a Mac. They offer a webpage where you can create your own dashboard in a browser window. Going to their site is then the equivalent of going to your dashboard.

It's actually a pretty good idea, and it's a wonder that it took someone so long to come up this idea. It opens up all of the cool widgets to users of Windows, Linux, and every other operating system that comes with a browser (which is just about all but the most arcane).