Bitly Alternative?

I've been using Bitly to make my affiliate/Adsense gallery links look like twitpics, and it's been working really well and without any problems for about a year. However, about a week ago I received this email from them:

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[TD]We have concerns that the custom short domain connected to your Bitly account, (my domain), may violate our terms and conditions, in particular by being misleading as it appears to impersonate a different website. In order to protect our service and the integrity of our reputation, we ask that you disconnect your custom short domain within the next 14 days.

Click here for instructions on the domain removal process.

If the domain has not been disconnected in 14 days, it will be removed.
If you wish to communicate with us as to why the custom short domain should remain active, please respond with your detailed justification within 7 days at [email protected]. We reserve the right to terminate service for any reason.

Thank you for your cooperation in this matter.

The Bitly Team[/TD]
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Does anyone know any alternatives I could use? All I do is post the link in bitly, and change it to my custom domain, and then write the Tweet and send it. Are there alternatives that do the same thing that works for Twitter?