If I was a person with Aspergers, I would be extremely annoyed that the term 'Aspie' is used here. Why not, 'for these people,' type of wording? Coining or perpetuating a term like that only serves to isolate anyone that might otherwise have been just a person with Aspergers.
My experience is that the use term "Aspie" divides the people I know who are diagnosed with Asperger's; it's similar to the way people are divided over the use of the word "hacker".
It has negative connotations to some, but if you are precise in the way you define the term, it can be a source of pride.
I thought it was a term of endearment and wasn't considered offensive by Aspergers folks... er.. "those with Aspergers"... seeing why the diminutive label is useful here. What do you call such a person? You don't call them an "Aspergers". "Aspie" seems to work.
I believe with most psychological or mental conditions, the phrase "a person with ..." is used, putting the person before the condition. Just like you don't call a person with mental retardation a "retard."