I have to admit, I've been reading AN for quite some  time but never bothered to sign up.  The interview with Billy Beane, though, just put me over the top -- it's a thousand times better than anything else in the Bay Area media, with the exception of Susan Schlusser and Mychael Urban.  So now I'm a little curious about the readership here, especially since it seems like a lot more people joined recently as well.