OS 10.5 - The acct "other" shows up on my log in screen, but not my list of accts.

I've got my acct log in and the guest acct log in setup with fast switching enabled. My acct settings page only lists those two as well, but when I log in from a reboot, the acct "Other" shows up as well. Anyone know how to get rid of this? I had a Mac certified store swap HDs as my old one died, and they re-installed my OS. Never had it there before, but now it's there and it doesn't appear to be listed anywhere else. Even when I go to fast switch to another acct, it won't show up. Ideas?