I have seen several documents saying different things.
Are 64bit windows 2003 + sp1 virtual machines supported ?
Are 64bit windows 2003 R2 virtual Machines supported as cluster nodes ?
Are 64bit windows 2003 R2 +sp2 virtual Machines supported as cluster nodes ?
and very important is vmotion supported on a clusternode.
Your last question is the easiest, VMotion is not supported on clusternodes.
Windows 2003 SP2 is not officially supported yet in either 32 or 64 bit, with or without clustering.
Windows 2003 SP1 and R2 are supported for clustering, I did not find a differentiation for clustering with 32 or 64 bit. Maybe others have more insight to this.
Daniel
64 bit MSCS is not supported at this time.
\- Anders