I'm wondering if I got hacked. I noticed my C:\ was shared, wtf. Maybe it has to do with how MacFUSE connects to my Windows partition in Mac OS X.
Larry Osterman from Microsoft answers this question here:
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By default C:\ is shared as a "hidden", admin-only share called C$. Only admins can access the share and the permissions cannot be changed. If it was shared as some other name, it would indicate either you, another admin or program running as admin added the share.
To minimize the possibility of the latter happening in the future, do not login regularly as an admin (assuming you do so now - if not, congrats!).