I'm desigining and building a new system from scratch that will provide its
users with the ability to send faxes on demand (amongst many other
features).

This new system will include a .NET 2.0 Windows Forms client with a SQL
Server 2005 database on the back end.

I would like to know some options for to accomplishing the [on demand
faxing] capability.

And yes, I've googled this extensively and somehow failed to find anything
apparently useful; but lots of people trying to sell me their online fax
services and fax machines :-(

Thanks!