Dr Dolittle – Yes, thats it. Burnaby is the city/suburb directly to the east of Vancouver, the mountain conservation area is actually a big hill with Simon Fraser Uni (SFU) on top of it. Some great trails on the east side of the hill (and a cool skills park on the north), good for some XC and introductory DH so recommended as a place to try out when you first arrive. Trail map and local forum here:
http://www.bmba.ca/gallery/v/trail_maps/trailmap2008.pdf
NSMB seems to be the main website for the Van/Whistler area.
Myself, Mark G and many other expat Brits are members of NSRide, a good way to meet people on regular rides and learn the trails. The season won't start properly again until April but the club does occasional rides over the winter and the forum is useful to organise unofficial stuff.
http://www.nsride.com/
Get in touch if you want any other advice before or after you arrive (email in profile). If you arrive this winter, just be prepared for a slightly unusual Olympics experience!