I hope they put all this money to good use. There are so many interesting ways to promote the idea, buses are just the beginning.
"The Atheist Bus Campaign launches today, Tuesday October 21. With your support, we hope to raise £5,500 to run 30 buses across the capital for four weeks with the slogan: “There’s probably no God. Now stop worrying and enjoy your life.” Donate online now!
Professor Richard Dawkins, bestselling author of The God Delusion, is officially supporting the Atheist Bus Campaign, and has generously agreed to match all donations up to a maximum of £5,500, giving us a total of £11,000 if we reach the full amount – enough for a much bigger campaign. The British Humanist Association have kindly agreed to administer all donations."
From http://www.atheistcampaign.org/