I found a quote today that I liked. It was on Mike Griffith's blog post on the top 10 estimating techniques. The quote was:
"If you cannot summarize it on only one page, you need to go off and learn more about it!"
This is really pretty good. I've always felt one of my strengths was the ability to summarize things effectively, but as I think about it I realize it's because I spend the time studying the subject. So next time you have to give a brief synopsis, go do your homework.