Awesome Lounge.
The folks who run it are solid, and pay attention to detail. They also really know their liquor and wines, so don't be afraid to ask for a recommendation.
The cocktails can be expensive, but are always fantastic and they have some excellent and hard-to-find beers on the menu.
It may be crowded, but I find this more of a great small lounge in San Francisco type of crowded than an annoying these people suck crowded. You're sure to bump into interesting people.
Great place to start or end an evening.