I tilt the glass and leave a little in the bottom of the bottle. I've drank straight from the bottle before when I didn't have a glass. It's not the end of the world but I like to let the beer breathe a little in a glass.
Camp Brew Co.
Primary: NoVa IPA
Kegged: Better-half APA
Bottled: Bourbon Oak Brolic Strong ale
On Deck: Turkey Brew, Stocious Stout, Pumpkin your Pie ale