Just saw an announcement for:
The Linux Enterprise Cluster by Karl Kopper
Nothing demonstrates our dependence on technology more than when a server goes down and office productivity comes to a screeching halt. Author Karl Kopper's real-world response to this scenario is outlined in "The Linux Enterprise Cluster" (No Starch Press, April '05). The book describes how he put several inexpensive computers on a network, installed free software and made the individual machines operate as one big server called a cluster, thus saving his company time, money and resources. "The Linux Enterprise Cluster" goes through every step needed from start to finish to build a cluster of Linux computers capable of supporting an entire enterprise reliably and cost-effectively.
Sounds very interesting, especially the focus on using software and hardware within the reach of most organizations.