No, I'm sure Cars is good (haven't seen it just yet), but Thad has posted the Tex Avery cartoon that may have inspired it, "One Cab's Family" (with voice work by Daws Butler and June Foray). It's the story of a taxicab whose son disgraces the family by wanting to be a hot-rod. It's unusually cute and whimsical for Avery, though he does manage to get away with showing the first bare butt in Hollywood cartoons; apparently it's OK with the censors if said butt belongs to a car.
Avery would follow it up by making virtually the same story with airplanes ("Little Johnny Jet"). Maybe that'll be Pixar's next feature.
Later on, Thad will be puting up some of the "Looney Tunes" cartoons produced by Larry Doyle. Doyle was a former "Simpsons" writer who was hired by Warner Brothers a few years back when they were looking to revitalize the Looney Tunes franchise with a movie (Doyle has the writing credit on Looney Tunes: Back in Action) and some short cartoons. Doyle staffed the short cartoons with writers and directors who had worked on "Family Guy" and "The Simpsons" ("Simpsons" stalwart Jon Vitti was one of the writers) and tried to emphasize that he was bringing a hip, contemporary feel to the characters. Unfortunately the results were generally pretty awful -- bad, out-of-character writing; design and animation that is strictly TV-level and TV-style; music (by Walter Murphy, of "Family Guy") that doesn't get the Carl Stalling style at all; and so on.
Most of the cartoons were so bad that WB didn't release them. They'd have done better to stick with the people who made "Little Go Beep" instead of assuming that they needed to bring in "Simpsons" people to give the franchise a boost; the failure of Back in Action (though Joe Dante and Eric Goldberg did what they could with the project despite studio interference) and the loss on the unreleased cartoons nearly killed off the franchise altogether.