A friend just told me about a free service to send a fax. faxZERO.com
It limits you to sending 2 faxes a day of 3 pages each. And it does send a cover page in front with the faxZERO information on it.
You can type in text, or upload a Word document or PDF file.
But for the occasional need to send the occasional fax, this could be just the ticket.