Dan, it's pretty easy for us to associate your old posts with your new user name. I've been working on doing that for the last couple hours, along with a few other things. If you can tell me what name in the old forum you used in the posts I need to assign to you, I can do that. Or, if you can tell me exact topics/posts, I can find and change those.
We're currently updating a big batch of the "Forum Guest" posts to show up as from distinct users.