honestly, I myself has no idea and I am still trying to digest this (can't belive it so easily) Quick question, why page rank is different for http://www.sitename.com and http://sitename.com
I didn't even know you COULD rent turkeys. Here I've been buying them every year. Now I find you can return the leftovers after the holiday?
Because the number and quality of backlinks pointing to http://www.sitename.com is different from those pointing to http://sitename.com -- the best remedy is to try to make all internal links point to http://www.sitename.com and request any link partners to do the same.
I would share my excitments as well. 5 of my sites went from PR0 to PR4 whilst one got just PR2 increment. Its time to rock now