If Apple can deliver these, they stand to gain a huge part of the market in servers. These boxes are super sweet, and would make for a great "home server" that lived in the basement. It integrates nicely with Windows as well as Unix (and of course Mac OS) boxes, and has built in gigabit ethernet (which means we'll all have to upgrade our equipment) and allows for unlimited clients.
I look forward to reading reviews of this system once it is released.