Generally, he was saying the same kinds of things Joe Biden was saying right after 9/11... if you were on campus then you'll remember that Joe said that the US depends a lot on intelligence from other (not our own) sources, and that while we have a lot of spy satellites and such, they can't show us what's inside the buildings and trucks. For that we need trained men and women who can infiltrate and risk their lives to spy and send back good information.
Kay noted that our info on WMDs came from basically one individual who defected from Iraq. This defector talked to a number of people through a liaison, and that's why so many nations believed there were WMDS... all of them were hearing the same story from the same individual but didn't realize it.
Kay is an interesting speaker, full of factual information, and surprisingly he has a nice dry wit that keeps things interesting. The UD news reported about his presentation, and it's a pretty good synopsis.
http://www.udel.edu/PR/UDaily/2004/Kay042904.html