This condition was also brought to my attention in the last 2 years. Although my son isn't ADHD, learning about it definately cleared up some myths for me. Here's where I went for info:
1) http://www.adhd.com/index.jsp ADHD Information and Support from Eli Lilly & Company. *American*
2) http://wholechild.net/addadhd.htm General information on ADHD/ADD *American*
3) http://www.add.org/ Excellent Resource! *American*
4) http://www.kidshealth.com/parent/medical/learning/adhd.html
This is an awesome resource on anything related to children's health! *American*