New promo for BTCS available on Youtube
The 2009 date for Back to Church Sunday is Sept 27th. According to their site, 3,000 churches took part last year, and over 30,000 folk said 'yes' when invited back to church.
Obviously, this is only one tool in the box, and not the answer to everything. It will work for folk who have dropped out of church 'by accident' - through changing jobs, moving house, or falling out of the habit. It won't work for folk who've never been near a church. And it will be a negative thing if you invite your friends and the church isn't welcoming!