thanks for the link
I found additional links in case someone else has questions:
What is MSDTC used for?
SQL Server 2005 requires MS DTC in the cluster for distributed queries and two-phase commit transactions, as well as for some replication functionality.
Should MSDTC be a clustered resource?
Microsoft only supports running MSDTC on cluster nodes as a clustered resource. We do not recommend or support running MSDTC in stand-alone mode on a cluster. Using MSDTC as a non-clustered resource on a Windows cluster is problematic. This configuration is problematic because transactions could be orphaned and you may experience data corruption if a cluster failover occurs