I thought I would try this as well so I can see if anyone is having the same issues as I am. After the server reset due to the Battle.net issue, I have been receiving serious lag on The Americas locale. I have already done the natural steps to resolve this.
I also have done trace routes to several outside locations all over the United States and everything is coming back within parameters.
I also have switched over to the Europe locale and have tested my ping on there as well and get a steady playable latency. For some reason though, going back to The Americas, the lag still persists.
EDIT: Some basic information is that:
Internet Setup: Directly plugged into modem