In addition to RFBD, there are other wonderful supports available for older children with learning disabilities.
Several excellent books are available to help you to explore the possibilities of a college life for your son. Have a look at Peterson's Colleges with Programs for Students with Learning Disabilities, The College Student with a Learning Disability: A Handbook by Susan Vogel, and Unlocking Potential: College and Other Choices for Learning Disabled People by Barbara Scheiber. And don't forget to check out the National Center for Learning Disabilities (http://www.ncld.org). They are offering scholarships for college for students with learning disabilities.