The PhotoPlus International Conference & Expo will be held in NYC at the Javitts Center on the weekend of October 22-24. It includes seminars, booths, conferences and many other interesting programs. Top dealers like B&H, Adorama, etc are both sponsors and will be have a booth - along with many others.

From the website:

The Most Important Event in Photography: October 22-24, 2009. Located at the Jacob Javits Center in New York City the show boasts a huge expo floor, hundreds of exhibitors, thousands of new products and a conference with over 100 seminars.
Link to website for more info:

Just a note for anyone interested in selling equipment: just emailed me and they will be there to purchase used photo equipment. From my personal experience, they are the most honest and fair buyers of photo gear of any dealer - and sometimes offer more than you can get by selling outright to an individual. They purchased a lens from me for more than the estimate they gave me online. Their offer was $285 - B&H offered $170 for the item.