Google Gadgets are mini-applications built using XML, HTML, using JavaScript or other front-end technologies for dynamic interactions. They can be used in a growing number of Google applications such as your iGoogle homepage, Google Apps start pages, Google Toolbar, Orkut, Blogger, Google Calendar, GMail, Google Sites. Google Gadgets have been extensively documented by Google themselves. For more detailed information – do visit their online documentation.

For the impatient here’s a short summary of the very basic steps in getting your Google Gadget up and online quickly on iGoogle. Basically all you’ll need to get going is a text editor and preferably access to a public webserver.
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