Shane posted a comment explaining that the reason McAfee's SiteAdvisor failed to detect any phishing web sites in a recent study by Carnegie Mellon University was because the free version was not intended as a phishing detector.

I think that's a fair point and worth clarifying. I was one of the early users of SiteAdvisor (long before McAfee bought it) and it worked pretty well at giving me background information on web sites I was visiting. I don't recall it claiming to detect phishing web sites but rather determing if visited sites hosted spyware or questionable links, or were poorly rated by SiteAdvisor's network of testers.

The Plus version of the product does claim to offer phishing protection and it wasn't clear from the CMU study if they tested the free or Plus version - I recall they just called it SiteAdvisor. It will be interesting to see if CMU clarifies this point or include the Plus version in future testing.