The Search Agency's Frank Lee was recently interviewed  by the editors of Practical eCommerce on the subject of driving improved PPC performance on Bing.
He points out that for most advertisers and merchants, the majority of their budget and account management will be devoted to Google. But the recent growth in search traffic, clickthrough rates, and conversion rates on Bing provide some great opportunities to increase volume.
Practical eCommerce  is an online magazine for small to midsize ecommerce merchants. Founded in 2005, it covers topics such as shopping carts, search engine optimization, pay-click-advertising, social media marketing and much more. The online publication and e-mail newsletters are read by merchants worldwide.