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A few weeks ago there was this one attack that tried to launch a DDOS against (I think it was) four of the (I think it is) seven (13 maybe?) root DNS servers. If I recal right, that did slow traffic considerably and put a lot of stress on the remaining root DNS servers, but it wasn't anything that they could handle.
About the physical security of those servers, I thought the actual locations of those are kept secret. I don't know... my memory's a bit foggy on this.
There's also talk of redesigning TCP/IP in general to make it more efficient and less prone to attacks - TCP/IP was designed back when the internet first took off. At that time, the most you would send was a little bit of information through your 5600 modem. Now with broadband, TCP/IP as it is isn't optimized for the large amount of data being sent. Internet2 - the academia-and-military-only successor to the current internet - is supposed to be about that.
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