BTW, probably mroe people on bike in Portland (hippies) and the Twin Cities (who knows why?) than in Denver.
What's so surprising to me about Denver is how many folks, even if they're only commuters, are on incredibly nice bikes. I don't see many true, commuter rigs. In the Twin Cities and Portland it seems like more people are on townies, cruisers, commuters, etc., more like Amsterdam.
Denver is jocks looking for extra ride time, IMHO.