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tr.im

Shorten URLs with or without registration.

Tr.im is now run by gravity4 and is still operating

Update: As of April, 2010, they no longer accept URL shortening requests via the website. They will also phase out the API interface by the end of 2010.

TightURL

TightURL

The URL returned by TightURL returns a HTTP Redirect to the browser, which causes it to load the original very long URL.