This tweet just came across from the New York City Department of Transportation:
@NYC_DOT: "Want #NYCDOTbike news on upcoming projects, riding tips and more? Subscribe to the NYCycles newsletter: http://bit.ly/dKOaqi #bikenyc
Also, the DOT has a pretty thorough section on what you need to know about bicycling in New York City, including maps, safety tips, and other resources. Check that out here: NYCDOT - Bicycle Information