Here are some sites that you should pay attention to, especially as a senior. Some you should have been paying attention to for years...
US Department of Education : ed.gov
ACT sign up and information: http://www.actstudent.org/
SAT sign up and information: http://www.collegeboard.org/
Peterson's helps to match kids with colleges: petersons.com
529 advice from Joseph Hurley, CPA: savingforcollege.com
Watson-Brown Scholarship information due by February 15
Sirrine Scholarship information due by tax day