I found this story this morning about a custom built rack of 160 Mac Minis. The developer was trying to determine how to maximize Mac computing space in rack structure now that Apple is phasing out the XServe.
“considerably cooler then expected. If you remember when I initially tested the machines in this configuration I had core temps hovering around 210F. That was hot… Now that I have them installed and the fans running I am seeing core temps around 85F, a drastic improvement.”