Red Bull has introduced their 2009 challenger, the RB5 (see also photos and technical analysis). Autosport reports that the design of the RB5 was kept fluid as long as possible, leading to the "more developed" look than some of the rival cars.
Personally I find the kink in the nose of the car the most visually interesting (but not pretty) feature, giving the car an almost hunch-back look when contrasted to the very narrow nose tip. It is difficult to make out some of the other details on the car given the paint scheme that Red Bull uses, so we will have to wait for the studio photos before we can examine them in any detail.