Any company can be DDOS'd and I work for a large hosting company with data centers all over the world. We are able to mitigate attacks with ANYCAST. Also many sites use Cloud Flare now in the same way. Somehow I don't think Mt Gox is investing enough in their infrastructure. If this DDOS was taking down a site spread out like the one against Spamhaus it would be all over the news. So in other words as someone who hosts for a living Mt Gox is pissing me off at the moment.
Google news resulted in 7 results for ddos mtgox and this has been going on for two days.