At Mapping America (available through the New York Times) you can find out where in the United States have more immigrants been settling in recent years. You can browse the distribution of racial and ethnic groups from the Census Bureau's 5 Year American Community Survey (2005-2009). Because these figures are based on samples, they are subject to a margin of error, particularly in places with a low population, and are best regarded as estimates.
Racial and Ethnic Distributions
By clicking "View More Maps" you can also look at things like education and income distribution for any area of the country.