Heather Mac Donald of the Manhattan Institute has pulled together here some great data on illegal immigrants in the United States: literacy, numeracy (great word, huh?), and crime rates; rates of out-of-wedlock births; and costs of various social services.
Bottom line: a large illegal immigrant population is a very expensive proposition, both in financial terms, and in terms of the people involved.
Mac Donald also notes that reports of illegals leaving the country in anticipation of the law's entry into force completely refute the conventional wisdom that says there's no way to get illegal immigrants out of the country.
Her interpretation of the politics surrounding the Arizona law: "The real reason for opposition to SB 1070 is that it will make immigration enforcement a reality and in so doing will show that law enforcement works; the hue and cry over racial profiling is merely a pretext."
Let's see what the judge decides: will this law go into force or won't it? Opinions, anyone?