I don't think there is any. We have been using a SQL Cluster with sde for a few years though, so I can tell you that for the most part you just set up your cluster and then treat it like a normal SQL server. Instead of installing an sde service on your SQL server, you use direct connect in ArcGIS. I don't remember how I did the install for ArcGIS 9 (I think I used the SDE installer to create the geodatabase), but in version ArcGIS 10, the Post Install crashes if your DBMS system is a remote system. That means you have to set up the geodatabase manually.