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...we've developed a Safe Browsing diagnostic page that will provide detailed information about our automatic investigations and findings
Google Security Blog [googleonlinesecurity.blogspot.com]
This follows hot on the heels of the Yahoo/McAfee tagging of Y! search results (SearchScan [webmasterworld.com]), and is perhaps a reflection of a level of competition to provide the 'safest' results.
They don't appear to be offering an interface for the results, but you can test a page via URL changes, e.g.:
the Yahoo/McAfee tagging of Y! search results (SearchScan)
Which famously tagged google.com as a purveyor of "Dangerous Downloads" (see TechCrunch).
Google's approach seems much better, but I am alarmed at the way so many anti-virus vendors are now intruding on the SERPs, and in some cases flagging sites they have not even inspected as "Suspicious".