Well, I'm using IE7, but it says version 7.0.5730, so there may be more to it than IE8 or not IE8. What are you using to create your pages? There are tons of unreadable code that usually come from using the wrong program. Publisher, say, or Word. When people do, it is not uncommon to see that support for Microsoft "save as html" is actually worse in IE than other browsers.
