As a regular, day to day beer I'm a fan of stella and various sam adams.
However my overall favorite is Weihenstephaner Hefeweissbier. Just seeing the name written and pictures of it is all the motivation i need to run to the packie.
Right now being fall and all I am really digging Tommyknocker's Pumpkin Ale. All time favorite would have to be Founder's Breakfast Stout, so delicious