Wow. I wish I had this resource when I was in high school.
ProProfs.com, a well-respected online educational service, is offering free online SAT test preparation. Part of their motivation is to help level the playing field for the students who take the exam, as studies have shown that students from wealthier families achieve a higher score than others (read: they can pay for SAT prep classes). The site has practice exams, study guides, flashcards, quizzes, cram sheets, articles, links and tips to help students succeed on the SAT exam. This site is loaded with resources and information and hopefully will reach the millions of students out there who take the test but cannot afford the ridiculously expensive prep courses. The site is professionally managed and designed, with easy access for all users. They will also use Web 2.0 technologies like Wikis to continually improve editing and content contribution.
Proprofs.com In Their Own Words
ProProfs.com, a leader in online learning, provides free resources to students and educators. ProProfs provides the tools necessary for students to succeed in diverse fields ranging from technical certification to college entrance examinations. ProProfs also delivers free e-learning content around the world to students from all backgrounds.
Some Questions About Proprofs.com
How are they going to market this service to the students that need it? Is the material of equal quality as those of expensive, private SAT prep schools? 
