Our failover has worked before, but this time the sql
server agent cannot start. Any suggestions at all about
where to start looking?

Check ad see if you MDAC 2.6 or above installed on the nodes of your
cluster. If so SQL Server Agent will not come online.

Look at this article:

MDAC 2.6 or Later Should Not Be Installed on SQL Server 7.0 Clusters
http://support.microsoft.com/default.aspx?scid=kb;[LN];820754

Rand
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