Google Chrome Frame is an interesting option for the developers that write web applications and use HTML or CSS features that are available in any modern browser except IE. They can add a meta tag at the top of a web page and enable the Google Chrome plug-in:
<meta http-equiv="X-UA-Compatible" content="chrome=1">
* Start using open web technologies - like the HTML5 canvas tag - right away, even technologies that aren't yet supported in Internet Explorer 6, 7, or 8.
Tip: After installing the plug-in, bookmark cf:http://mail.google.com/mail/ to speed up Gmail in Internet Explorer. You should also try to use the applications from the Chrome Experiments page.