Integration with third party URL shortening services

I think it'd be an awesome addition to Ping.FM if you could integrate any automatically shortened URL's into a third party such as http://tr.im/.

Tr.im is a really nice service; short domain, customizable link, advanced stat tracking, handy API....

There are also several other services out there doing the same thing with their own API.

I understand Ping.FM does it's own shortening and that stats are a planned feature, but as I see it, adding third party's would only improve your service (added reason for people to join + added satisfaction for existing users). It should also be pretty straight forward (I'd imagine) to implement...

Cheers :)