My understanding of unschooling comes from being unschooled my whole life, and unschooling ds (13 months.)
The way we do it is to let the child have his/her own interests, and focus his energy in what he is interested in, not pushing things on him before he is ready.
Every person has their own learning style, and unschooling enables them to learn at their own rate.
My experience was this:
I was given a lot of time to be creative and imaginative. I had a lot of edicational experiences, such as visits to the zoo, hiking, the orchestra (the Cleveland Orchestra, as well as the one my father played in,) and the art museum!
These are all still my favorite things to do! I had an extreamly large vocabualary at an early age. However, I was 11 before I could truely read. I just had other interests and reading was work for me.
I wrote (or dictated) entire books at a young age, though I couldn't even read them! I eventually decided that I was ready and learned quickly and was reading the classic novels within months.
I think my mother worried that I might never read, but has now seen that I love to read because it was enjoyable for me. Had she pushed, I think I would hate it.
In my "high school" years, I pursued my interests at a college level. I was intersted in things that I would be unable to learn without this way of life. Sometimes I would stay up for hours studying, and the next day just be outside taking in nature.
With unschooling you are always learning!
In unschooling you may have a syllabus (what you expect to learn) but not a curriculum (a planed method of learning.) We used real books, as opposed to text books, but most of all we learned from life!
I think it is also a good way to inpart your interests and appreciations to your children!
I think that this is the only effective way to "teach" A.D.D., or A.D.H.D. children (as well as everyone else.) But that's just my oppinion! I think Dr. Sears agrees with me
I hope that answered your question, but it was probably far more than you needed!