I think youll find its how the incoming links are formatted.
If all your incoming links ( and PR) go to
www.xxx.com, PR will show for that url, if there are none going to xxx.com, with no www, there will probably be no pr showing.
But Bill is right..PR aint worth much these days, except for spidering frequency.
Bill, I've emailed you and tried to get in contact re buying domains..can you get in touch please ?
Ill icq you again.