If you haven't been to one of these, you should definitely go. Check out the trailer for the 2010 world tour. Lots of mountain biking...
http://www.banffcentre.ca/mountainculture/tour/listings/regions.aspx?cat=RR&num=33&location=us
http://www.banffcentre.ca/mountainculture/tour/listings/regions.aspx?cat=RR&num=33&location=us