Then there are sections for current sales and rentals. Their listing cross multiple agencies and allow you to narrow down your search, whether it is the number of bedrooms, bathrooms, or the max dollars you want to spend. The results are given is the normal list format that is sortable for varied fields such as bedrooms, square footage, or price. The indiviual listings provide photos as well as an embedded google map that is expandable.
All in all, Curbed NY is a great site for a NYC real estate junkie. They also have sites for the Hamptons, San Francisco and Los Angeles.