bike companies are sponsored by microbreweries, and at least one microbrewery was started on a bike tour. Whether in the city or on the trail, they seem to always go hand in hand. It has even evolved into loose stereotypes where you can match the beer with the type of bike without even seeing the rider. See this chart from the Nipple Works research panel:
If you're a 29er rider who can take a swig of a muddy bottle and consider it the taste of mountainous accomplishment, this is for you.
This similar offering can appeal to all single-speeders, whether MTB, BMX, Cross, Fixed, Cruiser, etc.
Raleigh Coasting bike (http://www.raleighusa.com/)
Not only does this bike have a bottle opener on the front rack, but the rack itself is sized for your favorite 6-pack.
Ahrens WiseCracker (http://www.ahrensbicycles.com/)
This opener does not discriminate. If your bike has a seat post, then it will work. No frills, all function.
Swobo Cart Saddle (http://swobo.com/)
The opener below the saddle is pretty clever, but make sure to dismount before using it... unless your buddies don't mind the sight of you apparently cracking open a brew from your backside.