In the Star Wars Universe, a lot happens between Attack of the Clones and Revenge of the Sith. We already have the Clone Wars Adventures, a series of 25 three to fifteen minute cartoon episodes airing on the Cartoon Network between 2003 and 2005. Now, George Lucas adds depth to the Clone Wars with a new computer animated series, Star Wars: The Clone Wars. The adventures begin with the Aug 15 theatrical release, continuing in the fall with televised 30-minute "mini-movies" on the Cartoon Network.
Source: Star Wars: Clone Wars Official