If you are at all interested in unique web mash-ups and novel uses of AJAX, especially combined within the realm of the services offered by Google, you should check out Goosh, the Google shell.
Essentially the web site simulates a terminal window interface with the commands all being the various services offered by Google. This isn’t actually an official Google offering, which is a bit surprising, as this seems like something that Google would do. Perhaps they will be folding this in at some point, hard to say.
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