>I am being asked to migrate various SQL Databases, 2000 and 2005 to a
>single
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> sequences), however, can both SQL 2000 and 2005 run in the same clustered
> enviroment on different virtual mahcines?
You can run both instances in the same cluster. But why would you?
If your goal is to have a highly available SQL cluster with the best
performance and highest availability, that means you should be deploying SQL
2005. Migrate your 2000 databases to the new cluster after you have it up
and running.

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Russ Kaufmann
MVP - Windows Server - Clustering
ClusterHelp.com, a Microsoft Certified Gold Partner
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