Joe, is this a Veritas cluster or a Microsoft cluster?
I haven't tried it with SQL 2000, but with SQL 2005 and Veritas Cluster Server, it simply doesn't work.
Can you stop the clustering software but leave SQL running? If so, can you see the SQL databases under the physical node name?
Also, have you got Service Pack 3 installed? I seem to remember that one of the hotfixes claimed to have improvements for SQL cluster support. It still didn't work with the hotfix for me though. I upgraded to BE11d and it worked then.