Gfax Print To FaxThe Gfax Print-To-Fax service will let you use any fax machine in the world as a printer from your Internet-connected PC running Windows XP. (Windows Vista & 7 coming soon)
This service requires that you download and install driver software (available here). After installing the software you can use your Gfax username and password to access a web interface where fax credits can be purchased.
When you'd like to send a fax, you simply need to open a document, select "Print", choose the "Faxpl@form" printer, enter the recipients' fax numbers, and optionally define a coversheet.
Faxes can be printed tomultiple recipients, and any document format that your computer could normally print is supported for use as a fax message.