bignhams books suck. he doesn't specify trad, mixed, bolts, length of climbs, whether or not you need two ropes to get down. you know the sort of stuff that good guidebooks have in them. but that is what there is. for castle rocks i prefer the rock and ice that came out last year with the topos compared to the castle guidebook. but at least it is cheap.
i don't really see castle as a seperate crag. it is just more of the city. It was really crowded there a few weeks ago but by now the summer heat should have driven most people away. i think the biggest difference is that there are tons of easy and safe bolted routes.
red rib is a nice 10a arete climb. if you do big tyme do the direct 11a finish. it is fun.