Anything from Stone Brewery outside San Diego (Arrogant Bastard, Ruination IPA, Levitation, Russian Imperial Stout, Smoked Porter, Double Bastard, etc.). I'd say they're my favorite brewery. And the Bastard's my favorite overall, though I'll splurge on a Ruination bomber when I can.
I'm pretty much into hops. Titan IPA from Great Divide is good stuff. Racer 5 on tap is absolutely incredible - just like sticking your nose into a freshly opened bag of Cascades. And Hop Rod Rye rules.
Gotta go with some of the other recommendations on here though - Lindeman's is awesome, but I prefer Framboise over Kriek. Stella is excellent (and I used to live in Belgium so I have to say it's great). Yuengling - what more do you need to say than it's the oldest brewery in America? And Franziskaner is my favorite hefe (Spaten's my overall fave German beer though).
Anybody fortunate enough to get Dogfish Head beers needs to send me a Worldwide Stout (please?). I did get the 90- and 60-minute IPAs on a trip to Denver last month though. Yummy.
Other than that, I make my own. I stay away from the hard stuff these days. No use for it when there's a wee 3½ year-old running around the house (and another in the oven).