If you can, I'd recommend writing to the EventLog and creating rules in SCOM to monitor. We use this extensively and it works well, even to a point of putting together pieces of code which monitor certain elements of our apps and writing values to the event log, where SCOM parses for the errors, and graphs those, plus informational errors, into reports showing stats over a given time.
I am however quite keen on rewriting some that into WMI, and having SCOM poll the WMI service for those same counters, as writing queue lengths to event log every 15 minutes seems a little wasteful ;)
