I agree that Tom Wishon's site is an excellent place to start for getting MOI information. The MOI fitting principle is based on the idea that most folks have one or two clubs that just feel right and they hit the best. The MOI of that club(s) is measured and forms the basis for an entire set where every club is built to match that MOI. My understanding is that a consequence of an MOI built set of clubs is that the swingweight varies from club to club.
I did not want to pony up the ~$200 for Wishon's system without a little more information on how it has benefitted players. However, in my own messing around with club building and fitting clubs to my swing, my preference has been to build clubs on a shallower frequency slope (~ 4 CPM per club delta) and to also slope swingweight from low (D0 for long irons) to high (D4 or D5 for wedges). I like the extra feel I get with the heavier swingweight and more flexible wedges. The lower swingweight for the long irons keeps me from working so hard to square the face. One of these days I suspect I will go the whole MOI route since it appeals to the physicist in me.
