The slick interactive map titled Envisioning Development: What is Affordable Housing? [envisioningdevelopment.net] solves the questions "Who lives where?" and "Who can afford to live here?".
Users are able to select individual neighborhoods in New York City and investigate the number of families in each income category on an animated bar-graph-like construct at the bottom of the page. Selecting the question 'Who can afford to live here?' allows for the exploration of more detailed rent price information.
Housing is 'affordable' if one spends 30% or less of income on rent or mortgage payments.