I don't show up anywhere. On Yahoo, it only pulls up about three individual places where I have actually posted (2 profiles & one post) & Google separates my name into two words, so absolutely nothing there.
I just went on that boardtracker website and typed in my current username (paid to change) and it pulled up posts by my old username.
I know mdc is not in a protective bubble, but I feel a little less safe now.
Your account is linked by a number, so even if you change your name, the number stays the same. And, depending on when that site cached the MDC content, it could have been when you had your old username.
If you have usernames from other online forums those will probably be there too.
A username I had from a board I visited frequently about 9 years ago is on boardtracker. It was a big deal back then on that forum as well...that's why I try my hardest to keep my username and details as anonymous as possible.