Wow. That's awesome. The Muppeteers are always so friendly and approachable. How thoughtful of him to send that. You rock, Steve!
Nik: Yeah, that is a great building, isn't it? I frequently have to drive past there while driving en route to someplace else. I'm always craning my head as I drive by, hoping to see someone I recognize! So far, a no go, though.
Re Frank's voice: There are many Henson documentaries where you can hear Frank's real voice. If you haven't seen "Of Muppets and Men" (BBC, '81), "Henson's Place" (PBS, '84), or "American Masters: The Worlds of Jim Henson" (PBS, '94), hurry over to the Wanted section of this forum and get yourself a copy from someone.
(I'd offer to do it myself, but I don't have 2 VCRs at the moment.) There's also "An Evening with Jim Henson and Frank Oz" ('89), which is available on video from the Puppetry Guild, I think. Someone else will need to fill in the details of that one. (I haven't seen that one yet, but I definitely need to!)
I think Frank might also have been involved in the "Biography" episode about Sesame Street, which should be available on A&E's website. My memory's kind of foggy, though; can anyone confirm this?