I noticed a lot of Internet Explorer users complaining about annoying pop-ups. And when they run ad-aware, it looks like lots of spyware. Also, I hear an inordinate number of complaints regarding ISP service yesterday and today...check the DNS, especially Comcast users.
Maybe you've noticed a slow email day?
I think this cache poisoning is going to get worse. But, I've been wrong before.
Microsoft has posted an update on this.
The following is the DNS CACHE POISONING DETAILED ANALYSIS REPORT Version 2, which gives a history and some good details.