I just signed up to the meta.stackoverflow.com and then I clicked the associate accounts link.
When I had copied over the profile I noticed that I had two messages in my top bar. One of them was telling me to visit my profile page to fill it out, the other was saying I had the badge for filling everything out.
I guess it would need some sort of system that can when some messages occur they can cancel out others?
I just thought I would put this one out there as the regulars on this site probably don't go through the new user process very often although I understand it might be a lot of work for a not much reward.