Link accounts from other services to GSFN

A member of the Atheist Nexus recently pointed out that it would be a good idea to have an option to somehow link a gsfn account with a user's current account (instead of creating a new GSFN one) as this would allow them to post without having to remember two logins (or login twice) and would help them use support more.

Any ideas if this could be handled somehow?

I am thinking that another possible solution would be to allow posting with OpenID authentication which could automatically create a GSFN account (in case the user wants to edit it) and if the other service allows the same, then multiple account issues can at least be resolved through that path.