What? It's sorta common sense not to visit untrusted sites. Additionally:
"Those using the patched versions of IE bundled with Windows 2000, Windows XP and Windows Server 2003 are vulnerable to these bugs. People trying out the Beta 2 version of Internet Explorer 7 are safe."
If they don't like it use IE7, it's better anyway.
If you ask an average person if they visit any untrusted sites, they'll say, "uhh, what?" Because people don't know what that means. If you tell them, "Well, just install the beta version of Internet Explorer 7", they'll say, "uhh, what?".
What you're suggesting are hardly solutions. Computer savvy people aren't going to go there and might install newer versions, but my grandpa has no idea what any of that means.