If you're a website developer you may have run across several of the nuances presented with the more secure IE 6 for Windows XP SP2 - namely the Information Bar (the nice yellow bar that appears at the top of the webpage when the page attempts to perform some restricted action such as display a popup the user didn't request, or the unsolicited installation of an ActiveX control).

Here are a couple of great links to follow to learn more about those restrictions and how to make your website play friendly in their new environment:

Compatibility in Internet Explorer 6 for Windows XP Service Pack 2

Fine-Tune Your Web Site for Windows XP Service Pack 2