I've spent the last few years composing this online espresso map, and the Denver area is particularly up-to-date, seeing that I live/work here. http://www.pullcoffeeblog.blogspot.com
There are some decent shops here, as of late...particularly Novo, Crema coffeehouse, Aviano, Metropolis, Salvagetti (also a bike store)...and in Boulder: Ozo, Logan's, the Cup.
A head's up on Aviano: they just moved from their Lincoln location to North Cherry Creek (see map) on 2nd. st, in the old Peaberry.