As great as apple as at designing hardware, they are horrible at programming.
Case in point is iTunes, even though I have subscriptions turned on both my podcast section on iTunes and on the podcast section on the iPhone app, every single time my iPhone syncs with itunes it duplicates the files in my podcast. So now I have 5 versions of every podcast it’s ever synced since I synced my phone 5 times before I caught it… Again…
