Einstein is suspected of having been High-Functioning Autistic, not Aspergers. Because he had the language delay.
And I think someone on here before said Bill Gates was diagnosed PDD-NOS as a kid.
I have heard about Isaac Newton possibly having Aspergers, though I've heard no more than this and never any of his symptomology. Of course, I haven't tried very hard to find out.
Ludwig Wittgenstein, mentioned in another thread, is thought to have been possibly HFA because he had language delay as well, amongst other characteristics.
Possibly a good book to get which discusses a lot of these famous people as possibly having Aspergers is The Genesis of Artistic Creativity. However, it has yet to be released and the date has now been pushed back till August. (FYI: Overstock.com probably is selling it the cheapest in case anyone is interested.)
