There seems to be a redirect loop of some kind between gambitscheme.org and dynamo.iro.umontreal.ca/~gambit that doesn't resolve. When I attempt to connect to http://gambitscheme.org I get no page but a deep nesting of frames with source http://dynamo.iro.umontreal.ca/~gambit . Going to http://dynamo.iro.umontreal.ca/~gambit directly gives the same thing.
I can still get to the wiki by using the full URL