I know some sites like www.me.com bans IE6. It works when the page detects IE6 browser, it would trigger a DIV to let the user know the first time he accesses the website. Then the user closes, that notice won't appear again (at least for that session recorded in the cookie).
Where can I get such script?
IE 6 Blocker Script

See this answer for identifying browser, everything else is just jquery to add a div to the DOM and allow functionality for the user to close that. You could then write to the cookie to say warning has been shown.
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