IE7 and Firefox 2 - Who's the best phishing-fighter?

Before I go any further with the numbers, I think it's important to offer a little background on how the phish-filtering technology is set up within both browsers. With IE7, the user is asked upon installation whether he wants to allow the browser to auto-check all Web sites against a Microsoft database. (More about how this technology works in IE7 is online here, and the obvious privacy issues are discussed here.)

Firefox's default setting, in contrast, uses a blacklist of known phishing sites that is stored on the user's computer and updated approximately every 30 minutes. Alternatively, Firefox users can opt to turn auto-detect on, in which case the browser will check Web sites the user visits by checking them against a database maintained by Google. (More about the service is online here.)