Download the SQL Server 2005 Beta 2 documentation from here:
http://download.microsoft.com/download/a/d/5/ad5467b9-a388-46e3-a8ef-f45dc51425a7/SqlAbridgedBOL.msi
Then after you've installed it, open it up and go to the "Failover Clustering" section. That has a bunch of links that go over preparing to setup the cluster, and other interesting things to know.
Let me know if that doesn't give you the information you need.
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Thx, Niko
SQL Setup Test Team