Must think of a wonderful website idea

Okay, that does it. I need to come up with some sort of megga idea for a website. Have you seen what Google is paying for YouTube???? There has to be a million ideas still out there that have not yet been tapped into, I just need to find one of them and get it up and going for a few months and I can make a lot of money. Unfortunately, or maybe that is fourtunately, it don't work to think of what's wanted. The best ideas are those that are stumbled upon and accidently find an audience of their own. But oh to have such an idea and be able to sell the thing for millions or billions of dollars. That would be nice! Anyone wanna go in with me on developing the next multi-billion dollar website?