What IS Asperger's? That's the million-dollar question. There are many (MANY) websites that answer this question with varying degrees of detail and authority. Here are a couple of links for sites that seem to fall in line with what our educators and doctors have said. Bulleted lists of symptoms and signs can be very helpful.
20 Facts About Asperger's Syndrome in Children
Asperger's Syndrome Fact Sheet--National Institute of Neurological Disorders and Stroke