Short url generating

Hi.

I am looking for a plugin/hack/whatever or combination of these which will enable me to to the following:

– generate links for each post
– show short link on posts
– tweet short link
– create short links for links I choose (a la pretty links)
– allow others to generate short links with my short url
– all this is using a different (short) domain from the one where wordpress is hosted.

I have setup a url shortening service using yourls, and use the plugin to generate links for each post, which are tweeted automatically. However this doesn’t fullful the rest of my needs.

Is there a plugin which does all of the above, or a combination to create the desired effect?

Thanks in advance.