Star Wars: Clone Wars, Cartoon Network
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This is a micro-series, made up of a series of shorts about 3 to 5 minutes long (in the first two seasons) and like 12-15 minutes in season three. It's set between Star Wars episodes II and III (see Star Wars films). It's about the Clone Wars, The Republic versus the Separatists. Lots of great action, full of butt-kicking Jedi, clones, and droids... familiar characters like Obi-Wan, Anakin, and others, as well as new characters like the awesome Sith-wannabe Asajj Ventress, and the also awesome half droid/half alien Separatist, General Grievous (who is later seen in Revenge of the Sith, though I think he's cooler in the cartoon). It's a collaboration between LucasFilm and Cartoon Network, and it was made by Genndy Tartakovsky, creator of Samurai Jack, so hopefully that alone would tell you how cool this show is. Not sure what else to say, but at some point I should rewatch it and see if I can write up a more comprehensive review.

However, several years after the microseries, there came a new full length CGI-animated series called Star Wars: The Clone Wars (note the addition of "The" to the title). It seems like it will supercede, perhaps completely negate the microseries. Which is a damn shame. I can't even find anything about the microseries on StarWars.com anymore. Though perhaps you could find some events of the first series within certain characters' biographies in the site's Databank...