For those still using IE, here is something I found on WebmasterWorld, posted on 04-17-06:

http://www.webmasterworld.com/forum21/12101.htm

And the related tests:

http://secunia.com/Internet_Explorer_Address_Bar_Spoofing_Vulnerabili ty_Test/

This apparently affects only IE-6.

For security issues, I also check:
http://aumha.net/viewforum.php?f=48

And the Secunia main advisory page:
http://secunia.com/advisories/

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