I have been using Protus Virtual Fax for over a year and find it works flawlessly. You get an 800 fax #, which converts faxes to tiffs or pdfs and delivers via email to the berry. I can send faxes via
to clients for signature or print-to-fax anywhere. Great service.
Also, you can use Metamessage, which allows for just the print-to-fax option, without the incoming fax #.