I think there's a Norwegian purl video on this site too, many people find it easier than the standard continental purling. You might also look into Combined knitting. It's done with the yarn in the left hand, but the purls are wrapped so you have to knit into the back of them or they'll be twisted. You can find information about it at
www.anniemodesitt.com and also at grumperina's site -
www.grumperina.com/comboknit.htm