If you want to own Smith, and watch it on your own time frame (Lord knows when it will be "cancelled" from CBS' Innertube thing), you can get it at Amazon.com for $1.99 an episode. And if you haven't downloaded anything from them before, your first episode is free.
The downside is that it doesn't work for iPods. But you can watch the DVD-quality video on your TV (I connect my laptop with an s-video cable).
Amazon also has the stories of how the show would have gone, episode by episode. These aren't downloads, just free info. It's REALLY detailed, and I don't think I'm giving away too much to say that it's both heartbreaking and love-affirming.