In the old days, they diagnosed ADD and ADHD that way... now it's ADHD and ADHD-inattentive type. Same symptoms, different label.
Yes, Aspie is considered a Pervasive Developmental Disorder (PDD) just like Autism Spectrum Disorders (ASD), and in the new DSM will be lumped together. ADHD is not pervasive. The way it was described to me, ADHD (including ADHD-inattentive type) are people with some Aspie traits, but not enough (or not the right ones) to meet diagnostic cut-off for Aspergers.