Dr. Ned Hallowell has just written a terrific piece on what it's like to have ADHD for the Huffington Post.  You can just feel that ADHD energy in his writing!  To read it, go to this link.

(Amended) Melissa wrote a blog post on this topic at PsychologyToday.com which has been very popular...you can get lots of information about what it feels like to have ADHD here.