"But protecting the naïve user from the malicious attacker can mean the
blameless developer loses a feature they were relying on. Vista Beta 2
secures what's just been renamed Internet Explorer 7+ by running it in
a new protected mode, which restricts the changes IE can make to the
registry and the files it can update; but other security-related
changes apply to IE 7 for Windows XP as well.
Take the phishing filter built into IE 7 to spot fake sites;
this has already been triggered over 170,000 times during the beta,
which is good news – if they're really fake banking sites or some such.
But what do you do to make sure your site doesn't trip it accidentally?
" – The Register
Article Link: http://www.theregister.co.uk/2006/06/06/getting_ie7_right/