Virtualisation - conversion from one VI to another

There maybe a need to be able to migrate from one Virtualisation Product to another (vSphere to Hyper-V or vice-versa)

I've found some resources that can help.

Hyper-V to vSphere

A guide on how to convert from Hyper-V to vSphere VMs, which also has a link to a video from TrainSignal, can be found here.

vSphere to Hyper-V

There is now a tool that will enable you to convert vSphere VMs to Hyper-V 2012 which can be downloaded from here.