I spent several hours this afternoon scouring the internet researching this, and after doing so the owners manual sounds right. It's quite the controversy, but in the end I was able to draw a couple conclusions for myself. You don't want to baby it too much, and you don't want to go wide open on the throttle either. What you want to do is vary your speed, and get the rpms up now and then. Here is a link to a page that seemed to explain things pretty well, although it might be a bit out dated.
http://www.ntnoa.org/enginebreakin.htm
I plan to leave the mobil 1 the car comes with in during break in. Drive normally for the first 1000 miles without any pedal to the floor hard acceleration, but I will accelerate and make a point of getting the rpms up, and have a little bit of fun. After 1000 miles I will change the oil.