This is the most used browser on the internet so it goes without saying that it is imperative that websites are checked in this browser. The introduction of tabbed browsing and the support of png format images are the most noticable differences from ie6 though it is subtle differences in which it renders html is slightly irritating. With the release of IE8 Looming the staff at Gravytrain Limited are keeping there fingers crossed that they don't follow habit and release a browser that renders the code completely different to ie6 &7!!!