Great lists everybody! Cool that you all got to meet those great people.
I met Lisa Henson in person, at the MT&R Jim Henson event a couple years ago. She was really kind and gracious, and she like my dragon puppet! My puppet Rufus & I got a picture with her, as well as a signed copy of It's Not Easy Being Green - And Other Things To Consider. I know she didn't write it, but that's just fine with me!
I would've met Brian Henson as well, but I had to leave early as my flight was about to take me home. I would have planned to stay longer if I knew the presentation was going to be, well, longer! Oh well, I'm sure I'll get to meet him someday.