It turns out that the Boston gun buyback project is a much more successful initiative than anyone, myself included, ever expected. Much of the success is due to savvy marketing. There's the MySpace page for example. Here's one comment on the page from Shikiboo in Roxbury:

...Check it, the Boston Gun Buyback is a good step. All of those guns on the table could have been added up as lives taken instead. Big up to Mayor Menino, Target and all the people who turned in the guns. ...

And, there's a Typepad blog with lots of info and photos.