This might not seem special to those who have MS software licenses at work that allow them to download any MS software they want for free, but I would have loved this when I was a student, for our home network and servers. As such, this is probably only going to appeal to geeks who are full time students. Anyone with a .ac.uk email address can register with Microsoft DreamSpark at http://www.dreamspark.com/
This then allows you to download free, full versions of, among others:
Visual Studio Professional 2012 (normally £502 - http://www.microsoftstore.com/store/msuk/en_GB/pdp/productID.255123400?tid=stvIk17qq
SQL Server 2012 (normally upwards of £3k depending on deployment)
Windows Server 2012 (normally upwards of £600 depending on deployment)
Windows Server 2008 R2 ( currently £611.14 at Tesco
plus lots of other cool bits ond bobs to muck about with, some of which are available for free elsewhere like Robotics Developer Studio, Kinect SDK, MS Mathematics 4.0.
And free 90-day subscription to Plural Sight training (worth $87)