I spent a couple hours today helping a student look for a shape file of the First People's Language Map of B. C. (or anything even close to it). No luck, but feel free to chime in if you know of something we missed! Finally while Inspecting and Viewing Source, I tripped across an embedded (or linked, I can't even remember now) .kml file that included the coordinates for all the polygons. Yay!
I thought this would've been information that was much easier to find, so in the interests of saving the time of anyone else who might be looking for that same info, here you go:
Language_Boundaries .kml file for Google Earth
Contemporary Languages Boundaries shape file for ArcGIS etc. (.zip)
The student had emailed the owner of the site and got no response. Obviously I'll take this down if asked...
Oh, and while I was able to convert the .kml to the shape file within ArcGIS, I had a cleaner experience using the MyGeodata Converter.
Hope this is helpful to someone else!