As you probably know, the new Internet Explorer 8 will support new web parts called Web Slices. These can be added to the toolbar and work as an alternative to RSS feeds on your website.
Creating the same look of web pages in various web browsers and different version of them is like a nightmare. We have to test the webpage in Internet Explorer, Firefox, Opera and more and more often in the Safari browser. There are a few web browsers for Linux too. The biggest problem is to test and fix css problems in Internet Explorer, because different versions of this browser feature different css rendering.