I don't understand why some people say that the Cleave feat is useless to monks. Monk unarmed damage die increases up to 2d10 (without items, monk past-life feat, or Earth stance), and essentially counts as a one-handed weapon since you don't get glancing blows with your fists. Now, why shouldn't a monk take Cleave? Certainly, it's another clickie in a class that has way too many, but that doesn't in itself make Cleave useless for an unarmed monk.