My girlfriend's daughter has Asperger's and it wasn't caught until the girl's final year of college when she had a small breakdown. It took her mother a while to reconcile herself to the diagnosis, as she is a clinical psychologist and the signs escaped her.
I noticed that this girl did not dress to impress, was introverted, and did not hold back her opinions, LOL.
The American television drama, Parenthood, features a character with Asperger's. I'm no expert, but I'd say they've done a faithful portrayal.