How do I track subscriptions to my podcast

I have a podcast in the itunes store (and at http://www.spiritedfilms.com). I am trying to figure out how to track the number subscriptions I have. My popularity bar in the itunes store has been maxed out since my first episode, however, I have no way of knowing how many subscriptions I have. I have a hit counter on my web page which I created with iweb 06, but many people subscribe to podcast without ever checking out the website. I have tried Google Analytics, but it does not seem to be compatible with iweb 06. I was told that Google Analytics comes with iweb 08, but I do not want to purchase iweb 08, if it is not going to help me count my subscriptions. I am preparing to post a new episode and I want to resolve this issue first. Can anyone help me. Thanks.