Chris Wolf: A VMWare Clustering Recipe
Do you want to get to know clustering a little better. There is nothing like some hands-on experience. Unforunately, most of us don't have the hardware sitting around to do this.
Chris Wolf wrote a really handy article in Windows & .NET Magazine called A VMWare Clustering Recipe that steps you through setting up an Exchange cluster using VMWare. Most cool.
This won't teach you everything you need to know. Clusters are complex, but this will help you get more experience. I used this solution to take the screen captures for my Exchange Server 2003 24seven book.