All of the NPC information was in our pledge manual as well. We did not spend a lot of time on it as I recall, but I was one of the goofball nerds that read the thing from cover to cover and learned about NPC and at least learned about the different orgs. out there besides the ones on my campus.
I think it is fun to learn about the different GLOs and where they are located across the country. That's one of the things I love about GC - even though we're not face to face, I always learn something about other GLOs and HBGLO's as well that I didn't know before.
And while we're in the Panhellinic spirit, check out this fun web page:
http://www.npcwomen.org/about/badgeposter.pdf
I love looking at all the badges!