Here's an example, from March 29, 2009:
From their website:
On April 30th, 2009, one hundred St Louisians stepped up to the line and threw their dart at the giant map of St Louis City. They then had a month to visit the block where their dart landed and make a photograph. And here are the results!
And here's a sample shot, from Curt von Diest, of Kennerly and North Taylor, his dart throw's chosen block.
What great, yet divergent, windows into our photogenic city.