At work, I use IE 7.0 Beta, and I was finally able to at least isolate out the pop-up that causes it to hang. The ad starts a Webpage Dialog with the following code in the address:
For whatever reason, this causes IE6 to launch a new instance of Internet Explorer which goes to 100% CPU utilization. The initial IE6 instance is waiting for the other instance to do something, so it doesn't progress until I open up Task Manager and end-task the pop-up.
I don't want to have to end-task a process if I visit a page. At least with IE7, the dialog pops up as a empty window and I can close it easily.
So, until this is corrected, I'm only going to visit Blue's from work. Sorry, Blue.