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"After the closure announcement - and then sudden re-opening - of short URL service Tr.im, there's been some uncertainty about the widespread use of short URLs on sites like Twitter.  How do you know that the URL company won't just start redirecting the links to somewhere else?  Or what happens if that short URL provider shuts down?\nWith a vested interest in making sure that people can use short URLs confidently, many of the leading short URL providers have signed up for 301works, an independent URL mapping directory service (you can think of it like archive.org but for URL mapping).  The venture will be managed by GNIP, Inc.  The announcement reads:\n\nLeading Internet software companies have joined together to launch an independent URL mapping directory service. The new service will allow all participating short URL providers the ability to make their mappings available as regular updates or as a historical archive through the directory. The service is planned to launch in the next few weeks after participating companies individually inform their respective user communities of their planned participation. Once launched the service will be available at 301works.org and will be managed and run by Gnip, Inc. while the participating companies work to identify an appropriate non-profit organization to manage the directory long-term.\nIt is with these shared goals for improved permanence and transparency that Adjix, awe.sm, betaworks, bit.ly, Cligs, Gnip, URLizer, and urlShort have joined to launch this new organization.  \n\nIn plain English: the URL shorteners want to establish some sense of permanence to the mappings they provide, making users more confident that their links won't just break at some point in the future.  It's a good first step towards addressing concerns about the dangers of short URLs.\nThe notable absentee on that list: Tr.im has yet to sign up."^^<http://www.w3.org/2001/XMLSchema#string>
<http://mashable.com/2009/08/14/301works/>