Other than NCLD, I don't know about scholarships geared towards students with LD/ADHD. However, there are a number of resources available to help to smooth the way towards college for kids now in high school. Have a look at Peterson's Colleges with Programs for Students with Learning Disabilities and The College Student with a Learning Disability: A Handbook by Susan Vogel. LD Online also has a number of articles about this topic.
LD and ADD/ADHD Expert Advice from Eileen S. Marzola, Ed.D.