I've got a startup with an almost ready product, a team that has started businesses before, and is bootstrapped with our own money. I'd love to give a presentation, but I'm based in Europe. Does YC do Europe? (I'm more than happy to fly. Question is whether you care where a firm is based.)
There's a FAQ-section you might want to read, as it specifically mentions location. They don't care where you're based, but you do have to follow the YC program in the US. After YC, you could return to Europe, but it's probably a good idea to stick around. Provided you get a suitable visa, of course...
http://www.ycombinator.com/faq/
