Microsoft have released a 90 day trial of their Windows 7 Enterprise operating system. The whole process from signing in to download the trial was very smooth. I downloaded the 2.3gig iso quite quickly and apparently the license is already contained within the iso. The iso is an image of the dvd, that can then be burnt to a dvd.
To try Microsoft Windows 7 Enterprise yourself visit: http://bit.ly/gIm1H
Discovered via lifehacker. http://www.lifehacker.com