I lost my old Stack Overflow ID with the new OpenID changes. How can I get it back?
We can almost certainly recover this relatively easily, but you'll need to give us somewhere to start - what was your account called, for example? "here" (meta), or a moderator flag on SO may be quicker than the e-mail approach (heck, I'm here now...). We'll also need to confirm that it is your account. Then we can just merge with your new SO account.
If this is your account, then you just need to use the subdomain. I've e-mailed your openid to your listed e-mail address (from the old account).
Update: confirmed via e-mail discussion and merged.