It's hard to say for sure, Coulsdon, but we have evidence that media coverage has had some effect. For example, we have
these comments from Judge Nencini from last week:
At the end of the second trial, we had Mignini
saying,
In other coverage:
So we see there has been concern in Italy at least since 2009 about whether outside opinions will affect attitudes in the courtroom.
It would be best to be able to collect and measure the data, but I don't think anyone here would say there have not been apparent trends in the media coverage, and an overall increase in the amount of coverage over time. Today I saw Amanda on the cover of People Magazine for at least the second time. That would not have come close to happening in the first three years of the case.
There is no denying that among the people discussing and covering the case, a system of information and beliefs has gradually developed and traveled around the globe. It's just like anything considered newsworthy -- over time, more and more people become aware of it. It is inescapable that Italian judges will be exposed to the ideas. Your question is whether the judges will allow the ideas to change their minds regardless of Italian law.
The recent judges have shown us that they are not as familiar with the details of the case as many non-judges who have been studying it more carefully for six years. Therefore, the judges' decision about the case are springing from sources other than knowledge, such as emotions and political stances. Given this weakness, trying to influence them via the internet and in the media has certainly been worth a try.
ETA: PGP obviously agree, judging from their current maniacal campaign to contact as many journalists as possible via Twitter.