Maybe you can contact them and arrange something: http://www.virtualization.info/rent-a-lab/
This is their description:
virtualization.info Rent-A-Lab is a fully-redundant enterprise infrastructure available on demand.
Every part of the equipment can be reached and configured online, including physical servers, network switches and SANs. No need to transport racks to your site!
It can be used to introduce your customers new solutions, to train company staff on new technologies, to compare and benchmark different products, to evaluate new software features or try a new beta or to study for a certification exam. "
That's an interesting service, but I'm looking for something for more than a period of days, i.e. longer term, such as what we have in current colo setup.
VMware announced the "VMware Service Provider Program" in June of this year which sounds exactly what your after.
I would google for "VMware Service Provider Program" or VSPP, the first entry I came across was Macquarie news item .
A division of my company does this:
VMTN Communities User Moderator