Aside from what Rob said -- anything you'd get via BitTorrent would probably not be of much better quality than the streaming video from the AFL website, and with the AFL site, you have the advantage of being able to see the games in their entirety. If you're lucky enough to have a video card in your computer with a TV video output (I have one) you can run a cable to your TV and watch the games in more comfort; you just have to be a little clever with Windows Media Player to get the stream playing in a window you can maximize.
Here's how you do it: once you've selected what you want to see, a new browser window opens with the AFL's multimedia interface. When the clip starts to load into the player window, RIGHT-click on the video area and select "Properties" from the menu. A panel will open and there will be a convoluted URL listed under "Location". Highlight that and copy it, then close the panel and the multimedia window. Now open a separate Windows Media Player window, and use the "Open URL" command under the File menu. Paste the URL you copied earlier in here and hit ENTER. The clip should load up and start playing, and *this* player you can maximize to full screen, which if everything else on your computer is set right will give you a decent view on your TV -- or heck, you can just sit a ways back from the monitor.
Nothing's going to make 320x240 video squeezed down as far as the AFL site does look beautiful, but there are tricks you can use to make it more enjoyable. Considering you get a full year of access, the price the AFL's charging is really quite reasonable.
I hope this helps!
George Madison