Hello. I gave a talk on Gambit at ILC2010 yesterday. It presents highlights of both the Gambit Scheme language and its implementation.
You can find it at:
http://www.iro.umontreal.ca/~gambit/Gambit-inside-out.pdf
The .pdf is 24MB so it might be a longish download...
Many thanks to Guillaume Cartier, James Long and Robert Lizee for providing some nice demos. For the record, some participants said that now that they know Gambit they see less of a reason to use Common Lisp (whatever that means!).
Marc