So I've got an account on 43things.com. A handy site for tracking your goals and discussing them with people. Only there's one problem. I've not used it in a while and forgotten my username.
There appears to be no way to recover it, and, what's worse, they're so web 2.0 they've skipped old-fashioned things like a contact email address. And you can't access most of the site to look for your data without creating an account, which I would be happy to do, if I didn't already have one.
Update: They also don't support standard addresses like webmaster@43things.com.