The President and CEO of Prudential Douglas Elliman, Dottie Herman , is a big believer in publishing market data to create more transparency for consumers in the market her firm serves – Manhattan to Montauk.
Other reports we prepare can be found here. 
A report excerpt
…The regional economy and the continued difficultly for buyers to obtain financing continues to restrict the level of sales activity in the Queens housing market. Sellers continue to price property “behind” the market, while buyers who can get credit see less urgency in their purchase decision due to an increase in the number of properties to choose from. There were 39.1% fewer transactions in the quarter with a total of 2,737 compared to 4,491 sales in the same period last year. The number of sales is 52.7% below the level of activity seen two years ago. However, the number of listings slipped this quarter as compared to the prior year quarter. Listing inventory contracted 2.3% to 9,822 units from 10,053 units in the prior year quarter. Because listing inventory is expected to move in the opposite direction as the number of sales, this decline in inventory is believed to be an anomaly. However, the pattern suggests that there are fewer “casual sellers”…
The media coverage of the report is available here  as they were obtained (in no particular order).