I offer this in NYC with good connectivity to the equity markets. Currently its only offered to a few traders on a very limited basis but I am spending the weekend building hardware to expand.
The group that I offer this for (random non-affiliated 3rd party) needed to expand so I purchased more hardware:
http://www.supermicro.com/products/nfo/2UTwin3.cfm
I'm in the process of expanding the business (offering VMs to more traders (or anyone)) but I don't want to go into it too much as I don't want to break any solicitation rules, etc.
I'm happy to answer any questions you might have though.
A few things to keep in mind:
Security, software compatibility, up-time, location and connectivity.
See my virus thread (in backup & security) about keeping machines isolated. Software compatibility, up-time and location all depend on your needs. Do you need low-latency? Raw processing power? Why do you want to go virtual vs. a local box?
What type of machine are you looking for.
Again - without turning this thread into too much of a sales pitch I'm happy to discuss, explain, etc. because this is 100% where the market is going and a way to get an edge up on other remote traders.
Happy to also setup a demo session for anyone who wants to try it out.
Hope that helps!