AllTechRelated has a great list of free TV show-streaming web sites for the iPhone and iPod Touch. It's amazing what's available. I hope I'm not pointing you to something illegal, though some of the sites are obviously legitimate, such as the offerings from NBC and ESPN.
Update: this web page lists 3 Click, but as of a few days ago, the back door that someone had discovered to access the site for free was closed. Just as well, since I don't want to point you to anything that's not legal.