Any Windows IT guy/gal worth their salt should have a TechNet subscription. The download-only version (the one to get) at $349 for the first year and $249 for annual renewal, is an incredible bargain.
As a subscriber you get a huge array of non-expiring Microsoft software covering all their operating systems (including DOS), applications, server software and early access to beta, release candidate and RTM software (I'm actually writing this on the full release version of Windows 7).
In addition there is access to free training, managed newsgroups and two FREE Support Incidents (this is worth the price of the subscription alone at $259 each).
I'm not trying to line the pockets of the Redmond empire, I just believe this is a great value for anyone working with/or training on Microsoft software; the benefits well outweigh the price.