Google’s Webmaster Tools has, for quite some time, provided verified website owners with a partial list of pages from their site in which Google found badware during their scanning. Unfortunately, it was often frustrating to site owners to know that Google detected something on a page without knowing what the problem actually was. This frustration should be largely eliminated now that Webmaster Tools has added an experimental Labs feature called "Malware Details," which at least in some cases provides more information to the site owner, as shown in this screenshot from the blog post announcing the feature:
This is a big step forward and should make life much easier for the website owners whose sites have fallen victim to malware. Now, if we can just get Google to share this data with us, so we can better help users who have submitted review requests…
[Update: I just saw that the same blog post mentions another feature, Fetch as Googlebot, which will display a particular page as seen by Google's web crawler. This also, as noted in the post, can be helpful in diagnosing malware, as it allows the site owner to see how Google's view of the page differs from the user's own view. One cause of such a difference is malware that responds differently to different agent or referrer strings in the http request.]
