A bladelogic scan indicated one node of the server was at SP1. After I failed this test server over, I was able to see SP1. I just wondered if there was a way for me to tell if both nodes in the cluster are at the same SP/patch level without failing over.

SQL 2005 I always installed on Active node, and I experienced the same problem as you with the passive node not getting all the updates. I like SQL 2008 much better, maintains availablity in the process.