Mac mini computers make sweet servers for most applications. However, integrating them into a rack poses some challenges. How do you securely mount the minis? How do you keep them cool? How do you turn them on without pulling them out of the rack? How do you plug in a thumb drive for a quick update? Sonnet's RackMac mini solves all these challenges and more!
It's a fun idea, and maybe some Xserve users would migrate down to Mac minis using this technology? I'm not one of them, though.