Good news: You don’t need to have Internet Explorer 8 installed in your PC!
The service that offers a preview of a website in Internet Explorer 8 is ipinfo.info
What the site does is, it takes the URL of the web site, it users the Internet Explorer 8 rendering engine, renders the site and saves it as an images and displays it to the user. It has also got support to other flavors of Internet Explorer. I guess its important of blogger/website developers/others who own web page to have a look at the how their site will look in Internet Explorer 8.
So all you have to do it type the URL of the website (eg. www.techdreams.org) in a text box and click to proceed.
This is how your favourite website techdreams.org looked when it got renders in Internet Explorer 8.