Microsoft promised to back-port some of the technology that's going into IE7, and their anti-phishing filter is now available (see software requirements below).
Microsoft® Phishing Filter Add-in for MSN® Search Toolbar (Beta)
Increase your protection against identity theft and financial scams. The Microsoft Phishing Filter Add-in Beta warns you of Web sites containing suspicious content and protects you from accidentally sharing personal information on reported phishing sites with a dynamically updated online service.*
Requires MSN Search Toolbar with Windows Desktop Search and Microsoft Windows XP SP2, Microsoft Internet Explorer 6 or later
Tools like these are great, and people should use them, but being realistically cautious and aware is still the most important and final layer of defense.
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