Zodiac is the most accessible route with sustained aid-climbing on El Capitan. It is consistently steep (slighly overhanging) with many traverses and a couple of wild spots. The climbing is enjoyable, from wide cracks to thin seams, and all the techniques (free, hooks, clean gear, nailing) have to be used. Amanda Tarr, Ken Younge, and myself climbed this route in June 1996. It turned out to be my last big-wall climb.