Bear in mind that you will only be able to implement a 2 node cluster due to the limitations of virtual SCSI adapters. Clustering requires windows 2003 Enterprise OS. For a detailed description of how to do this try VMWareland.com
What are you planning to do with this? Clustering is fine and dandy but if both nodes are on the same host it sort of defeats the object, can be useful for testing.
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"Ya can't make an omelette without breaking just a few eggs" 😉