I came across a blogpost from Derek Harkin about port monitoring from a text file in SCOM. It essentially makes it possible to use a text file to type what machine you want to reach and at what port and it will check that every ten minutes and display a health status.
Here is the link to the post: http://derekhar.blogspot.com/2009/08/port-monitoring-from-text-file.html.
Great stuff Derek!