The College Board: A good place to start; The College Board provides information on college searching, careers, information and registration center for SAT and SAT Subject Tests.
The Common Application: The Common Application was established in 1975 by 15 private colleges that wished to provide a common, standardized first-year application form for use at any member institution. Almost 500 colleges/universities now accept The Common Application.
Peterson’s Guide: One of the first college guides; provides a searchable database and profiles for thousands of colleges.
Unigo: College reviews by current students, student photos and videos.
College Results Online: Data heavy site that offers profiles of freshman retention rates, graduation rates and demographics of the student body.
Academic Common Market: Maryland participates in a consortium with 16 southern states to offer in-state tuition at out-of-state institutions for academic programs not offered at Maryland institutions.
Noodle: "Noodle will tell you not just a list of colleges matching your search--if you enter your grades and transcript information, it can tell you which ones you are likely to get into, and which ones are rated most highly by students like you." NPR
College Navigator: U.S. Department of Education college search
National Survey of Student Engagement: What You Need to Know Before You Go