Google seems to have done pretty much the same thing with one of my accounts. It started a couple weeks ago when I needed a gmail account to test a mail server bug. When I created the gmail account they changed my 'primary' address to the new gmail address.

Then in the last couple of days, they decided that my secondary email address was now part of a Google apps account because it was associated with a Postini mail filtering account. They removed the secondary email from my account and created a new account for it using the same password.

Now I'm stuck with two different email addresses for logging into various Google services.