I notice that a lot of people on here use the Porter Cable or are interested in getting one. Here are a couple of sites that have a lot of useful information. One has everything you need to know about detailing and also has videos on how to use the PC. Here ya go:
http://paintcare-n-detailing.com/
http://forums.roadfly.com/forums/detailing/forum.php?postid=1430487&page=1
http://paintcare-n-detailing.com/
http://forums.roadfly.com/forums/detailing/forum.php?postid=1430487&page=1