I support this idea:

Silence can say more then a thousand words… On April 30th, 2007, the Blogosphere will hold a One-Day Blog Silence in honor towards the victims of Virginia. 33 died at the US college massacre… This day shall unite us all about this unbelievable painful & shocking event and show some respect and love to those who lost their loved ones… The Blogosphere is in deep mourning.

Update: Steli Efti is one of the people behind this creative and heartfelt effort.