The Hunt for Gollum is a prequel of sorts to the Fellowship of the Ring. It is a 35 minutes short film that is "made by fans for fans". It is not based on any of the events in the book.
http://www.youtube.com/v/FnMHgwG9aAo&rel=1The story is simple, after the news of the rising of Sauron's army, Gandalf and Strider are concerned that Gollum might tell the enemies about the Ring's whereabouts. Therefore, Strider goes East in a dangerous journey to hunt down the wretched creature.
For a film made by fans without any commercial purposes, I'd say it's a very impressive effort. It is well made, the story is compelling, and the production values are really good. I give it 3.5/5.
You can stream the film for free in standard or high definition at the following site:
http://www.thehuntforgollum.com/I also know that it is available "somewhere" on the web in kff.