Brewery: Russian River
Why they have cult appeal: One of the longest lines we encountered at GABF was for people to get a taste of Pliny the Elder and other awesome beers from the California craft beer stalwart, and if that's not a seal of approval from the nerdiest of the beer nerds, we don't know what is. It also helps that only 4 states (CA, CO, OR, and PA) can get their hands on it.
Most culty beer poured at their booth: Framboise for a Cure, their seasonal raspberry brew for charity, was a mad popular pick, but nothing beats Propitiation. That Baltic porter aged in wine barrels was made as a one-off for SF beer bar Toronado's 25th anniversary, and has never been bottled. It's impossible to find anywhere else.