Not that I've felt the need for brain doping (beyond caffeine) so far, but I've been following the field of cognitive enhancers from a safe distance for a while now and have summed up the current state of affairs in a feature for Chemistry & Industry, which is out in the May issue:
Smart New World
Chemistry & Industry No. 5, pp32-35
In the same issue, I have a review of the book:
Gold nanoparticles for physics, chemistry and biology
on page 47.
Maybe the smart pills could magically convert me into this guy: