Offering a product for free may sound dumb, but you don't have to look any further than Google or Skype (www.skype.com) or Gilette to see that 'free' can unleash viral marketing, emancipate the masses and make you a bundle all at the same time.
How about TwX? Does a free TwX service make sense? Could TempWorks release a free TwX service out to the staffing industry market and expect users to embrace it- of which a percentage would sign up for enhanced pay-only services?
How closely does TwX fit with established success factors for 'free'?