Denver's home for stand-up comedy, Comedy Works has been delivering the laughs since 1981. Open seven nights a week, Comedy Works features the best and brightest comedians on the road, plus Open Mic Night, new talent contests, etc.
I think they rock since they are an incredibly friendly and professional organization, offer good deals for their clients, have a variety of talented and skilled comedians appear from all across the U.S., etc.
Jim Norton, Lisa Lampanelli, Louis CK....I love that Comedy Works never shies away from the harsher, more politically incorrect comedians. Also, they have crowd control and bar/food service down to a science.