I'm heading up to the South Fork of Kolob on Friday. Is there much climbing beyond what's listed here and if so, is there a guidebook I should get?

No guide book for the area. Lots of old aid and trad lines in the canyon, but if you are looking for overhanging sport routes (which is what most people travel up the canyon for), then the listings on the MP page are up to date. Have fun, it was perfect weather on Saturday (light fleece for the belay, t-shirt for the climb) and the leaves are about at their peak of color change.

Parowan Gap is another near-by crag with some good climbing (just north of Cedar City). It is easy access from I-15 and makes a nice stop as long as it isn't too windy or hot (south facing wall that is well exposed to the sun).

rock climbing utah has some minimal info