BTC Trading Corp is claiming DDOS and Mt Gox has in the past. Why don't I ever hear of other webites getting DDOS'd? How do other sites protect against it and why can't our Bitcoin sites do the same?
You can't really. I'm in the gold farming and bot business and we are under constant DDOS with additional pile-ons when someone in China wants us offline for a bit. Thing is, our DDOS is only in the 5 to 15 gbps range. I saw that the attack on one of the mtgox servers peaked at 38 gbps. That is a lot of traffic to mitigate - I'm impressed that they manage to still provide a service.
All they can do is try to have redundant servers and tons of bandwidth.