I agree with the Golden crowd, have had more than my fair share of $1 bullets when i was living in Golden. I am living in Highlands Ranch now and have yet to find a place to "call my own". Big Hoss Steak house in the highlands area (41st and Tennyson) has a great happy hour in that area with 1/2 off appys and $2 coors.
We have a small group that does what we call BATH night (Beers at the Hyatt). The new one on 15th has a decent HH that we frequesnt. A little quieter atmosphe if you're up for conversation. Usually other interesting people from out of town.
The Yard House at Colorado Mills has a happy hour 3-6pm every day.The beer isn't that cheap ($3.50 I think) but the apps are half off. You can get a pizza for $5.