TRRed, thanks for the helpful advice. Your link even leads to a list of hotels with shuttles!
I guess I should have been clearer - I've been in places like Chicago O'Hare where the taxi lineup is outdoors and can be a one hour wait, or even San Francisco where taxis are plentiful, but quite expensive (more expensive than a booked limo) - and just wanted to get some insight about DEN from FTers.