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.
So there's a daily podcast - read more at the New Humanist site. You can subscribe to the daily podcasts by email or rss feed.
First up was Stephen Fry, and we're promised further luminaries.