We have a great group of Hyper-V MVPs who contribute greatly to our users. Recently there have been some interesting posts about running different operating systems under Hyper-V.
Last Thursday, Alessandro Cardoso posted a detailed guide to installing RedHat 6.1 and setting up the latest integration services. You can read about that here: http://virtualisationandmanagement.wordpress.com/2011/08/18/hyper-v-detailed-step-by-step-installing-redhat-6-1-vm-in-expert-mode-with-the-new-linux-integration-services-3-1/
Then on the following day, Lai Yoong Seng post a video that shows you how to get Android running inside of a Hyper-V virtual machine: http://www.ms4u.info/2011/08/running-android-on-hyper-v.html