I did a tracert and found that I am having the same problem. I have just been frustrated all day because I just built a new PC and thought their might be something wrong with it. I live down in the Miami area is south Florida this has been a horrible experience.
Yea, so I'm really thankful that Ceas had pointed this problem out. I thought it was my ISP for some time, and blah blah blah. I have a decent comp too, and was really hoping there was nothing wrong haha. And yes, my lag spikes are very frequent, and sometimes they just stay like that for a solid 5 mins or so.
It's just the internet failing us :P No worries eh?