I've been getting a lot of emails lately about junk faxes. It seems that some stock spammers are running coordinated fax and email campaigns. US junk fax laws seem to have a few more teeth than anti-spam laws, so if you're getting junk faxes there are things you can do. The FCC page about unwanted faxes is a good starting point and includes a link to a complaint form. If you want more information on the subject, the independent junkfax.org seems to have a good collection of information and resources.