I hear that Greatest Events in Sporting History is pretty good, now that I have the shameless plug out of the way I will give you some advice.
The BBC are pretty good resource for podcasts since they put out quite a lot of their shows out in podcast form, meaning there is a large selection of very well produced shows, just a case of finding a topic.
It really is a case of searching for your own interests, reading the reviews and taking a chance, there are a whole load of podcasts that I have only ever listened to one show of.
If you list some of your interests here, maybe people point you in the right direction