The Yarn Harlot knits this way. Below is a YouTube video of her knitting.
Lever knitting is generally used by people who knit for a living. It incorporates both speed and efficiency. Lever knitting is considered to be the most ergonomic way to knit, thus enabling knitters to knit up to 10 hours a day without fear of RSI (repetetive strain injury).
The Lever knitting technique tends to result in a more uniform knitted fabric because both purling and knitting require small and similar hand movements.
If you're interested, there's an excellent Lever knitting article by sweetgeorgia. It's a fascinating read. And other one by Maven Knits.
In the article by sweetgeorge, mention is made of the Yarn Harlot's workshop: "Knitting for Speed and Efficiency". If you haven't already done so, sign up for her workshop on Saturday, 21st January, 2012 at Cotton-by-Post.
Lever knitting is all about how you tension the yarn and how you hold your right hand. As with most things there are a number of ways you can do it, and what suits one person, may be the archilles heel for another.
Me? I'm finding it really awkward. This is quite possibly due to the fact that I'm a continental knitter and hold the yarn in my left hand. I will however persevere because I'd like to be able to knit with the yarn in either hand.