I am a night worker and listen almost exclusively to poker related podcasts every night. I prefer the podcasts that have mostly strategy content as opposed to those that offer news and poker pop culture.
Tournamentpokeredge.com has a good podcast for MTTs, although there is only one episude every 2 weeks. Being relatively new, they only have a library of 5 or 6 podcasts to date.
Another good one in my opinion is grinderschool. They offer mostly strategy content for cash and MTTs. They have been broadcasting for 3 years and have some exceptional stuff in their catalog.
Thirdly, 2008(?) WSOP
ME runner up pro Dennis Phillips and amateur Paul Harris team up for a weekly podcast from St. Louis or Phillips calls into his partner in St Louis from where ever he is playing that week. This podcast offers a combination of news, interviews and strategy. I think it is one of the better ones that offer a variety of poker topics.
I also listen to Pocket 5s, CardRunners, 2+2, RoundersRadio and Ante Up Magazines podcasts.
I hope that helped.
m'E runner up Dennis