New Humanist magazine (they of the humanist trading card fame) - have an advent calendar in which every day in the run up to the annual midwinter festival of conspicuous consumption one of:
a stellar selection of comedians and scientists speaks about explains which scientist or philosopher they would like to celebrate each year as a rational substitute for Jesus, as well as what scientific Winterval gift they'd most like to receive.
The British Humanist Association have teamed up with Richard Dawkins to push a message on London buses.
It's apparently in response to previous pro-religion bus advertising (see Ariane Sherine's comment article at The Guardian). You can donate to the campaign here. Fund raising has exceeded expectations - perhaps the campaign with run and run (round and round?). As of 28/10/08: