Yesterday, Stephanie pointed out an article on this very subject (originally from The Los Angeles Times, cited here in The Ledger)
As the article says:
"In my mind, it [modafinil] may be the first real smart drug," Sahakian said. "A lot of people will probably take modafinil. I suspect they do already."
The age of cosmetic neurology is upon us. Let the made-for-TV movies begin. :)