As far as Boulder? Or just in Denver?
The Dry Dock Brewery is in Aurora, a suburb 15 miles southeast of Denver, at the intersection of Chambers and Hampden, just East of the Cherry Creek Reservoir. They won Best Small Brewery at the GABF last year. They are having their Oktoberfest today.
In LoDo Denver there is Great Divide, Wynkoop and the Falling Rock Tap House. The Falling Rock has 70 taps, hundreds of bottles and is having special tappings every day beginning Monday at 5 pm. If you get into a Rockies game the SandLot Brewery is downstairs below the pub. The brewers are all ex-homebrewers and keep the good stuff down there. They were also Best Small Brewery of the year at GABF in ?'07.
There are 2 new restaurants in LoDo which specialize in beer selection and food pairing: Euclid Hall and Frescraft. I have heard good reports, but haven't been to them yet.
The Rackhouse Pub has 20 Colorado taps. They are having all GABF medal-winning beers this month. They are near I-25 and Alameda. And their food is good. And they are neighbors of Stranahan's Whiskey. And just up the street from there is the Breckenridge Brewery with their tasting room and barbecue restaurant. Pint's Pub is near the art museum. Their beer isn't so hot, but they have a great Scotch selection.
The Cheeky Monk on Colfax has several Belgian taps and a new beer place just opened called The Uptown Brothers Beer Bar.
Further into Cherry Creek is the Bull & Bush brewpub. They have also had several GABF-medal winning beers.
If you are heading toward Boulder there is a brewpub in Arvada called Yak and Yeti's. It was previously the Cheshire Cat English brewpub, but was bought and is now an Indian Restaurant. The Floyd Brewery should also be opening any day now in Old Arvada.
Golden, just West of Denver, has the largest brewery in the world - Coors (or should I say SABMolsonCoors?). And the 2nd largest brewery in Golden, the Golden City Brewery.
There are several breweries in Boulder worth visiting; Avery, Boulder Beer, Asher, and Mountain Sun Brewpub. Mountain Sun has a beer restaurant in Denver on 17th called the Vine Street Pub with some of their beers and some guest beers.
Longmont just North of Denver has the Left Hand Brewery and Oskar Blues production brewery which has a tasting room and a restaurant across the street.
North of there in Loveland there is a new brewery The Grimm Brothers which just opened this year and specializes in German biers.
Of course, Fort Collns just north of there has New Belgium, Odells, Fort Collins Brewery, CooperSmith's BrewPub and a new brewery the Equinox.
If you are tempted to visit the mountains, just about every town hs a brewpub. There is Breckenridge Brewery in Breckenridge. The Dam Brewery and Pug Ryans in Dillon and Backcountry Brewery in Frisco - about a one hour drive. All prize-winning breweries. As well as the Glenwood Brewery in Glenwood Springs (about a 3 hour drive West of Denver on I-70).
And a lot of the breweries are having special events. The local homebrew club KROC has an event Thursday night with homebrews and talks by the brewer at the Bruery and White Labs - highly recommended. And this is the 2nd year of Denver Deer Week: for more info check out www.denvergov.org/denverbeerfest
I'll pretty much be at the GABF and the Falling Rock. See ya!