I thought there was another thread about NHC 2009 down in Oakland but I couldn't find it. Just found out that the group rate at the main hotel is all sold out. There are still rooms available at the regular rate ($210/night).
There is a Courtyard Marriott across the street and I just booked my room there since I procrastinated too long to get into the main one. Courtyard Oakland Downtown: Rooms designed for business travelers in Oakland