Via Kottke: AssembleMe put together a nice set of NYC population graphs for the NYC Demographics page on Wikipedia. What impressed us what how dominant Brooklyn has been in population for the last 90 years-- although it looks like Queens is closing in, having passed Manhattan in the late 1960s. Even Staten Island is closing in on Manhattan-- maybe it's the rent prices!
Another interesting data set from the Wikipedia page: "The racial makeup of the city was 44.66% White, 26.59% Black or African American, 0.52% Native American, 9.83% Asian, 0.07% Pacific Islander, 13.42% from other races, and 4.92% from two or more races. Hispanic or Latino of any race were 26.98% of the population. 35.9% of the population was born outside the United States of America (18.9% born in Latin America, 8.6% Asia, 7.0% Europe). The ethnic makeup was 11.5% African-American, 9.8% Puerto Rican, 8.7% Italian, 5.3% Irish, 5.1% Dominican, 4.5% Chinese, 2.1% Asian Indian, 1.8% Filipino and 1.6% Korean." Also, there are almost a million Jewish people here!