From Brickipedia, the LEGO Wiki
- LEGO Star Wars celebrated its 10th Anniversary with the release of it's 10th Anniversary Line.
- The BIONICLE story was moved to a different setting: Bara Magna.
- LEGO Indiana Jones 2: The Adventure Continues was released.
- LEGO Universe was originally due to be released this year, but it was delayed and was now released in 2010.
- LEGO Rock Band was released.
- The LEGO Company changes its slogan from Play On to It's A New Toy Every Day.
- The first Farm related System sets were released under City.
- LEGO celebrated its 50th anniversary of the stud and tube System brick.
- The Clone Wars continued with the release of its second and third wave in January and August.
- LEGO Star Wars: The Complete Saga was released on PC.
- General Mills released some promotional sets.
Themes introduced and discontinued
- Pirates are re-introduced.
- Space Police III are introduced.
- BIONICLE Glatorian and Glatorian Legends are introduced.
- City Farm is introduced.
- Power Miners is introduced - promoted by creation of a mini-movie.
- Agents 2.0, a subtheme of Agents, is introduced.
- Indiana Jones and the Temple of Doom, subtheme of Indiana Jones, is introduced.
- LEGO Games is introduced.
- Mars Mission is discontinued.
- Batman is discontinued.
- Exo-Force is discontinued.
- Belville is discontinued.
- Teaser websites for Atlantis, Ben 10, and Toy Story are created.