The book The Hobbit was the predecessor of The Lord of the Rings. After three Lord of the Rings movies, three Hobbit movies will follow in 2012, 2013 and 2014.
This site, which is not the official one, reports on the filming of The Hobbit and gives information on places and persons of the story.
Apart from that, books informes about books by Tolkien.

Hobbit Film News Blog

Part 3 will be released on December 10, 2014.

12/1/2014: World Premiere in London [Video]

11/07/2014
Main trailer: The Battle of the Five Armies

07/28/2014
Trailer: The Battle of the Five Armies

10/03/2013
2. Trailer: The Desolation of Smaug

06/11/2013
Trailer: The Desolation of Smaug

12/06/2012
ew.com published an interview with Peter Jackson and six movie clips.

10/24/2012
The first movie will be approximately 2 hours 40 minutes long.

09/20/2012
The second trailer is here!

09/02/2012
Titles and release dates for the three movies are revealed:
The Hobbit: An Unexpected Journey - December 14, 2012
The Hobbit: The Desolation of Smaug - December 13, 2013
The Hobbit: There and Back Again - July 18, 2014

07/30/2012
There won't be two, but three Hobbit movies, Peter Jackson announced. The third one will be shown in summer 2014.

07/06/2012
The Hobbit movies finish filming, next stop is the cutting room.

06/06/2012
World premiere will be on November 28th in Wellington, New Zealand.

5/21/2012
A look at the Hobbiton set at Dailymail.

12/21/2011
The trailer is here!

10/28/2011
The Hobbit is set to premiere in Wellington, New Zealand in late November 2012.