Get Server Control, Virtualization with Free, Open Source Xen
"It's almost mind-boggling that every 18 months or so, regular as clockwork, you can get twice as much computing power. In fact, it is mind-boggling, and these high octane servers can cause some hassles in the data center. In this tip, I explore the standard fixes applied when server shoppers go overboard. These include server consolidation and grid computing. Then, I explore another option: virtualization with Xen."