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Gameburst; the only one I have settled on. Just about the only one that doesn't feature a load of swearing and meaningless off topic chatter.
Due to my love for retro games I can't recomend this podcast enough.
http://www.retrogamingroundup.com/
5-6 hour monthly podcasts dedicated to classic gaming. Definitely my favourite podcast. Even downloaded back episodes goign back to the beginning
Another really good sounding one that I will start with this weekend. Thanks for the link.