If you're looking for a good place to grab a beer before hitting the clubs, I definitely recommend the Brickskeller in DuPont Circle. They have over 800 different types of beer in stock...probably more now. Also, it's real close to Wisconsin and M Streets in Georgetown. Real laid back place.
Another good place to chill is the Washington Harbor, just outside the main bar area of Georgetown. They have a few decent bars (a little pricey) centered around a big-ass fountain. Had some luck finding "wives for the night" at that place. It's right on a non-smelly part of the Potomac, and you occasionally see some pretty sweet boats roll into the area. This place has some self-important people, but I imagine if you're writing on this board, you're big enough to put them in their place.