It was not long ago that I got all excited when I came across the XenoCode virtualized browsers. This seemed a neat idea. At the time one could download an executable (they seem to only be available in-browser now) and run one of the major browsers without interfering with the operating system or confguration you …
Cross browser
Easier Cross Browser Testing
Every web developer will spend a sufficient chunk of their time testing and fixing webpages so that they work across as many browsers as possible. We all groan at the mention of IE6, which is here to stay for a little while yet, even with the various efforts to change that.