There are some interesting videos available at Vimeo. These compare various aspects of the VMware vSphere platform vs. Microsoft's Hyper-V. Based on these videos, it appears that VMware has the lead on features and functionality in most aspects. Check out these videos, as listed below. Each video is under two minutes.
Virtualize everything - http://vimeo.com/channels/polygraphtest/67457046
Maximum Uptime - http://vimeo.com/channels/polygraphtest/67457047
Total Cost of Ownership - http://vimeo.com/channels/polygraphtest/67456994
Built for the Future - http://vimeo.com/channels/polygraphtest/67457048
Happy viewing - please let me know what you think!!
Ravi