Apple has made an new Xserve model available, the cluster model. This Xserve has no videocard, only 1 gigabit ethernet, only 1 Harddisk, no cd-rom and only a 10-user (the smallest available) OS X server license. It has the same price as the entry-level Xserve but the cluster model includes a dual processor. It’s purpose is clear. Grinding bits away. Put 20 Xserve-clusters in a, surprise, cluster and keep that data coming.
In my opinion this show clearly that Apple is taking the server market very seriously and the Xserve isn’t an one-day-fly.

Xserver cluster