I while ago I was recorded doing a brief presentation on how the Hyper-V architecture fits together.  If you have been to a presentation by me on Hyper-V you have probably seen me talk about this – but it is always handy to have an online version:

http://www.microsoft.com/video/en/us/details/3c31b7d8-7502-4505-84ab-9999717d8692

Cheers,
Ben