Internet Explorer version 8 (beta) was release on 3/6. I downloaded it at work and have been playing with a little. One cool thing that I've found is something called "WebSlices", which enables users to subscribe to content directly within a webpage. Developers can mark parts of webpages as "WebSlices" and enable users to monitor that information. The beta release is really only meant for designers and developers, but is available to the entire public. More info here. You can download it here.