The Sail Freighter Tres Hombres
Just came across details of 'Ambassador of a new fleet of sustainable hybrid sailing vessels ( fair transport )'.
The 32 meter brigantine Tres Hombres has been in service since December 2009. They say she maintains a sustainable freight service between Europe, the Atlantic islands, the Caribbean and America. Besides a cargo capacity of 35 tons, she has accommodation for 5 crew members and 10 trainees. Currently in Falmouth UK.
The link to their site is http://svtreshombres.homestead.com/ There is a page where you can sign up for a voyage as guest crew.
(Someone should persuade them to build a junk freighter!)