Windows Vista™ provides you with a reliable, secure, and visually stimulating platform to build upon. Businesses depend on the ability to access and act upon information from a variety of sources. Windows Vista was designed from the ground up as the next generation platform for connectivity. Windows Vista also features a visually stunning interface. The new Microsoft Windows Presentation Foundation gives you a powerful base from which you can build high fidelity applications.
Sign up for 3 web casts, participate, and they'll give you Vista Business for free.

Same goes for Office 2007:

http://vsd.powertogether.com/campaign.aspx