One significantly better feature about Bing is that it doesn't have any "compare to x in another window" boxes checked by default. I switched from Kayak to Mobissimo because of that (despite the fact that their name is so annoyingly hard to remember that I kept inadvertantly going back to Kayak) and unfortunately Mobissimo eventually checked some boxes by default too. So now I'll use Bing.
That's because there is significant income in the popups generated by those checkboxes. But hopefully bing is leading the way in making them disappear.
