For what it's worth, this is quite a vulnerability in the internet's routing system. It's also the reason Youtube went offline after Pakistan was deliberately announcing the wrong routes a few years ago because it didn't agree with some videos being broadcasted by Youtube.
Yes, but you'd have to con a lot of big players into trusting your BGP routes first. And the effect would only last as long as it took to change some configurations and write you back out of the internet.
http://www.ripe.net/internet-coordination/news/industry-deve...
http://news.cnet.com/8301-10784_3-9878655-7.html