The list of hotfixes is currently very small, but it may increase as time goes on. It is a good idea to bookmark this KB article for any future FCS deployments.
I always keep the recommended Windows 2003 SP1/SP2 cluster hotfix list bookmarked for any cluster deployments I do. It is just a good practice to follow. I like being over informed than under informed.
Microsoft, Forefront Client Security Deployments, FCS Deployments, Security Updates, Patch, Hotfix