Rahul wrote his best post ever, about hiring the 'best possible athlete' - specifically referencing Dick Costolo's Ask The Wizard post on the same topic.
In my view, this is right on the money, and can be make-or-break in the startup crucible.
As usual, Joel Spolsky was right a long time ago about trying to find Smart, Gets Things Done people.
The important caveat here was lucidly described by Malcolm Gladwell in his 2002 piece, The Talent Myth which touched on such juicy topics as HBS rockstars working for Enron.
More generally, Naseem Nicholas Taleb, author of Fooled By Randomness, and coincidentally the subject of a Gladwell profile himself, has made a personal crusade out of attacking the notion of 'experticity' pervasive in our society - that is, assuming anyone who has passed the bar is a good lawyer. A good primer in Taleb's typically fun, but dense style can be found here.