Just a quick note regarding deployment of the activity grapher I described last week. This is now deployed and working a treat but I did have a minor problem getting it going. Turns out our current production implementation of sharepoing isn’t using the delegation model for Excel Services security. Instead we’re using the trusted subsystem approach (typical for a farm). In this instance to get the UDF going I just needed to remove the impersonation I was using for my dev/test environment.