once I selected all "travel sites" & all "airlines", i got a warning "you are about to open 20 tabs" and I promptly closed the tab. I don't like the idea of opening that many tabs or the fact that I need to select individual airlines or sites. I rather get all the data in 1 page first and then filter by removing airlines/ sites.

I really like the cleartrip guys when it comes to travel/ticket booking. It's mostly India only but check out the UI & usability -- really nice. http://cleartrip.com