Paul Kedrosky wants instant message accounts which can be short-lived. This could be very useful when working on a project since once the project is done, you can eliminate that account. If you were already talking with those people, they will more than likely have your real account so getting rid of the project IM won't matter. On the flip side, the folks you didn't talk to before the project, won't need to IM you afterwards.
Of all the IM providers, I could see GTalk be able to handle it or actually anyone using Jabber. You could have your own server which proxies the communication between the temporary account and you.
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