UWA Widget

The Universal Widget API (UWA) offers a powerful framework for Web widgets development.

The benefit of doing a UWA widget is that you develop it once and it directly works on Netvibes, iGoogle, Windows Vista, Apple Dashboard, Live.com, iPhone, Opera, blogs, MySpace, etc...

You can find an example of UWA Widget that display the tick of server, it's in javascript (right click->show source):

http://atys.ryzom.com/servertick/widget.xml

And the result:

http://eco.netvibes.com/widgets/305491/server-tick