I am currently running OGR on 18 computers and will install a few more in a week or two.
I'm constantly on lookout for cheap components and computers to add to my farm.
I enjoy free electricity, but the space the cases take in my rather small apartment is a problem, as well as the noise and the 2kW of heat they generate.

That being said, I'm planning a "rack closet" which should house 50 or so computers (which is about the point when my fuses begin blowing ). So expect my contribution to increase little by little as my farm grows until I reach that goal, fry due to the heat or my landlord notices the electric bill!

Good to have you on the project guru!

-S