DDoS cripples Bitcoin exchange Mt. Gox after trading resumes
news.cnet.com
news.cnet.com
Mt.Gox has became that controlling central without consent from even itself.
That said, many people are working on alternatives. It's a growing pain. I need to do more research but the concept behind this project looks very promising: https://github.com/macourtney/Dark-Exchange
I don't do Bitcoin though so I guess the big question is whether a service like MtGox is actually reasonably necessary or not. It sounds like what MtGox has above and beyond GMail is the built-in network effect that has propped other exchanges up throughout history; you go there to trade because that's where the traders are. You don't have to go to GMail to exchange electronic mail.