What software do I need?

You can use iTunes to keep track of your podcasts. It's got an in-built "podcatching" function. There are several other "podcatcher" programs (known technically as "aggregators"). Apple's "iTunes" is a well-known example and is possibly already on your computer (otherwise you can download it here for free). "Juice" is another program for managing podcasts. Each of these is a standalone program and Juice is also free. Some websites also have "podcatching" functions built-in, like Yahoo, Podnova and Odeo. (You may need to register with these sites if you are not already registered.)