http://www.mototuneusa.com/break_in_secrets.htm

I've come across a few articles before that actually say to give it some juice (with in reason).
This one relates to motorcycles, but the process is basically the same.

BTW I'm not saying do this - I don't know shit about engines, I just found it to be an interesting read as it offers a different opinion with some information to back it up.

For those in the know, feel free to discredit it.