I'm not sure that it exactly qualifies as marketing, but Avinash Kaushik's "Web Analytics: An Hour A Day" is really great on how to design for and think about p

I'm not sure that it exactly qualifies as marketing, but Avinash Kaushik's "Web Analytics: An Hour A Day" is really great on how to design for and think about project metrics on the net, which in my experience is one of the biggest advantages that the great guys are holding.