Well, even beyond the books: Tartakovsky's original Clone Wars microseries was the best part of the prequel trilogy and both Raven and Bioware's forays into the EU in their video games have been spectacular.
The original Clone Wars series was a literal work of art, to be honest. The whole thing was a spectacle of absurdly awesome action and fight choreography.
I've noticed that with lots of media that aren't the main film series, some of the best instances of Star Wars material is stuff that has very little to do with Jedi. Republic Commando is one of the best examples of that. In terms of music, the KOTOR games won out for me, because they used original themes, added their own material and made the soundtrack their own thing entirely (best example was the opener track to KOTOR 1).
There's still a smidgeon of untapped potential in the series. I'd really like another linear shooter in the vein of Republic Commando, something dark and gritty and immersive in the eyes of a regular clone trooper ala Battlefront, but set pieces that aren't punctuated by "Objective Complete" and "New Objective: Destroy Object X at Location Y".
And also, I am distantly psyched for the distant live-action TV series that has pretty much nothing to do with Jedi in terms of central focus. Probably because at some point I saw "Star Wars" and "Battlestar Galactica" in the same sentence.