Beginning crunch is underway on the sinrager prestige class. It's mostly intended as a fun and flavorful option for barbarians, but there's nothing stopping other classes from getting in on the action (well, besides those pesky alignment restrictions for paladins). The idea is that, by the time I'm done, each Rage of X ability will provide some abilities appropriate to the sin they're associated with for the duration of the rage, such as Rage of Gluttony giving a variation of Swallow Whole, a bonus to Disarm checks for Rage of Envy, or a Charm Person SLA for Rage of Lust.