Same old same old story
My site was erroneously flagged last year by Site Advisor as a "spam source" in spite of the fact that my site sends out no emails whatsoever--not newsletters, not opt-in emails, nothing.
It took six months and threat of legal action to get Site Advisor to change the rating. They have (or had at the time) no formal appeal or review process, and even though they admitted immediately that the rating was flawed (they blamed it on an automated "software glitch), it still took months for the error to be corrected.
Classic McAfee, in my experience. Why this company continues to exist is a mystery to me.
Interestingly, the Wikipedia entry on SiteAdvisor has been sanitized (by a self-identified McAfee employee) to remove all references to problems and false positives. Classic Wikipedia, too, now that I think about it.