Originally Posted by Flickerdart Or PrCs, of which Incarnum has plenty (which I suppose is really just multiclassing with a funny name when you get down to it). It's a form of multiclassing, yes, though the goals of a prestige class tend to be a bit different from a base class.
Originally Posted by Calanon Raven_Cry's comments often have the effects of a +5 Tome of Understanding The Good Cat Purrs For All Don't Take My Sunset