In mid-January, they released the data from the UJA-Federation 2011 Geographic Profile. It provides statistics of wealth, denomination, intermariage and other valuable knowledge about the NYC community broken down by county. I have seen no discussion of the data.
Among my observations is that in Manhattan only 18 % light Shabbat candles or are in household that lights candles. In the national studies of 1990 and 2000, it was about 36 % then 32% making it one of the most kept rituals. The keeping of candle lighting was one of the firm ritual kept out of nostalgia or filial piety, not anymore. In addition, kashrut in Manhattan is down to 17%, made up of the Orthodox and half of the Conservative. On the other hand, Shabbat meals is at 32%- meaning that synagogue sponsored Shabbat meals are attractive even to those who dont light Shabbat candles. And 32% study Judaism, much higher among those younger.
the whole study is here Geographic Profile (PDF)
A breakdown by counties is here Jewish Community Study of New York: 2011 Geographic Profile
Let me know if you discover any interesting trends.