If Google want to play at being god...
I think the point that many of you are missing is that where adverts are the issue that Goolge has the technology to help stop the adverts being served but instead of providing that information so that the adverts can be stoped they tell you the page that they were being served from.
Now anyone who has a site that serves adverts will know this is less that useful. The minimum you need is (1) "where was the advert called from - the country - to deal with geo-targeting of advertsing systems" (2) the time it was called (3) the name of the malware being directed towards (4) the advertsing server / network the file is being loaded off and (5) if possible the name of the advert file that is the problem - at the moment usually a flash swf file.
In fact the final bit of information will often be enough.
I'm pretty certain that when they set their test suite on a site that it records this information and if that is the case they could stop the advert being delivered which is surely their goal.
Hopefully Google's Policy team will realise that they can help the situation more by providing enough information to allow the advert to be stopped than the current policy which is to hide their head in the sand and blame the site that was unfortunate enough to have the advert served on there site.
For those who say the sites should be more careful I would say that the example we say was subtle in the way it worked it didn't attack always and didn't appear to be harmful at all. Even more sophisticated all the celver code was held on a remote server which was interrogated in some hidden code to see if it should deply the badware. This is non trivial (if you don't know what you are looking for) and hard if you do.
It has taught us to be much more circumspect but also highlighted the fact that there is an organisation out there that could really help fight this problem but they choose to sit on their hands while waving them shouting "its there" when in fact it is somewhere else.
The additional problem is that as people see more of these "warnings" against sites they use regularly they will loose their effectiveness. A warning that really means something is worthwhile otherwise users will think that Google is "crying woolf" and start ignorning then and problem is that they also use this same warning for sites that have been compromised by hackers and which are dangereous to all visitors rather than being dangerous to 1 in 250,000.