Michigan Department of Education has an information rich Web site. Most of the statistical analyses researchers will need are loaded and readily available. Among the titles available: Michigan K-12 School Districts Ranked By Selected Financial Data
OECD Education Database: provides internationally comparable data on key aspects of the education systems. On-line access features data on: educational finance, students enrolled, new entrants to a level of education, graduates, and educational personnel.
Unesco offers a couple of data sources:
World Bank Data - Education offers data on education inputs, participation, efficiency, and outcomes. Much of the data here is from UNESCO (see above) but they also draw from official responses to surveys and from reports provided by education authorities in each country.