A Microsoft TechNet Plus subscription is aimed at IT Professionals who want full-version Microsoft software, beta software, professional support incidents, managed newsgroup support, a technical information library, Microsoft eLearning courses, online concierge chat, the TechNet Magazine, and many other resources for evaluating, deploying, and maintaining Microsoft software. The subscription normally goes for $349 (download-only) or for $599 (download and DVD shipments). You want it free though, right? No problem: Canada link, US link, and UK link.
Source : Ars Technica - One Microsoft Way
UPDATE :
Sorry folks, looks like Microsoft made a mistake. The free subscription was not meant to be public but only for members of the ITAC program. If your one of the lucky persons that was able to get in and obtain a key, Microsoft has disable your account and place your key on the black list.
More info : www.neowin