Marketcircle has updated Billings Pro for iOS (Website) (App Store). The new version adds iPad multitasking. When I saw the screenshot, I was immediately taken with the update. This is exactly the kind of implementation I was hoping for with iPad multitasking. Adding billing entries while working in a browser or calendar makes so much sense to me. We are on the verge of significantly improved iPad productivity. I can feel it in my bones.