Hi Michael,
E-fax provides an SDK that you can programmatically invoke to send faxes. Of course, that requires a fax account with them and some code to call their APIs. We never created the "tool" that I suggested we would "over the weekend" .
However, we would be very happy to help you create a fax solution for your InfoPath form, and help you sell it to the InfoPath masses. Please e-mail me separately if you are interested.
Cheers!