Another plus is manageability. Software loaded on one blade can be replicated very quickly. IBM is devoting a lot of resources towards its blade strategy -- see this url for more info: http://www-1.ibm.com/servers/eserver/bladecenter/. Because blades are still in their infancy, be prepared to pay some money if you're seriously looking at blade servers. Truthfully, if you're a small company with 320 users and already have a small computer room with servers, unless you're looking to move and space is at an absolute premium, I would hold off a bit -- until the costs drop and more people have really started to use this technology.
This was first published in October 2003