The Association of Research Libraries has published the ARL Annual Salary Survey 2007–08.
Here's an excerpt from the press release:
The 2007–08 data show that ARL librarians’ salaries outperformed inflation for the fourth consecutive year. The combined median professional salary in US and Canadian ARL university libraries was $61,833—a 3.7% increase from the previous year. Over the same period, the Consumer Price Index rose 2.4% in the US and 2.5% in Canada.
The ARL Annual Salary Survey 2007–08 analyzes salary data from a number of different perspectives, including race, ethnicity, and gender. Minority librarians make up 14.1% of the professional staff in US ARL university libraries; the percentage of minorities in managerial or administrative positions is lower. Women comprise 69.4% of minority staff members.
Gender-based salary differentials persist in ARL libraries in 2007–08. The overall salary for women in the 113 ARL university libraries is 95.4% of that paid to men; this figure compares to 95.7% in 2006–07. While the data show a marked closure of the gender gap in ARL libraries over the long term—in 1980–81, women in ARL libraries were paid roughly 87% of what men were paid—the data also raise the possibility that the closure has peaked, and that a 5% gap between men’s and women’s salaries may persist.