On my Android phone I use the doggcatcher app to download podcasts. I go well over 3gb each month, but as a Sprint customer I currently do not need to worry about the limits.
I could certainly set the app to only download on wifi and avoid the issue entirely. However, it is quite nice to have it check hourly for new podcasts and download them at that point no matter where I am.
AT&T has pushed on us hard. We pay almost $200 for 2 people. We will be moving over to T-Mobile when the contract is up. It will save us almost $100 a month and still keep the unlimited plan. Ive had enough of AT&T for a while, im just waiting for this damn contract to be done with.
I could certainly set the app to only download on wifi and avoid the issue entirely. However, it is quite nice to have it check hourly for new podcasts and download them at that point no matter where I am.