College Results Online

The Education Trust, an organization that advocates for students, developed this useful tool to compare different statistics across all the colleges and universities in the United States. You can find the graduation and retention rates, tuition rates, median SAT / ACT scores, demographics, etc. If you're looking at one school, you can find similar schools, and for those trying to decide between schools, a comparison tool is available. Similar tools like this are available through sites like U.S. News and World Report, but I don't find to be as exhaustive.