iGoogle is Google's customizable start page. Users can add any number of gadgets to their page that can be custom-tailored to link up with all sorts of Web services and serve as mini applications or newsfeeds.
One of the features that makes iGoogle especially neat is it can be customized with different themes that change by what time of day you're looking at the page. Users can create their own themes that go into the same directory that houses the thousands of developer-created gadgets.
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