Given the amount of navel-gazing of the blogeoisie (c) Bill Thompson, I'm sure someone has found examples of blogs that have proved to be a catalyst for a change in public policy. I just haven't come across any such examples yet.
One example deserves such a fate. Here is a way that we could all save time when we park our cars. This suggestion should be picked up and publicised widely. Once upon a time, there used to be public information broadcasts that advised us all on bits of commonsense wisdom. For instance, one infomercial advised us not to park cars on corners (a man used to instantly transform into in clown when he got out of his badly-parked car) because this blocked the view of drivers who were trying to pull out of a side-street.
Geoff deserves one of these broadcasts to state his case. The BBC should be alerted to this gap in it's Public Service Broadcasting remit forthwith.
At this point, modesty should forbid me from publicising the first of many bloody good ideas on that have appeared on this site. I'd be interested to see if anyone has ever taken a similar posting and turned it into a mainstream discussion.