A144: Since it can be used to cast spells from wands and the like, and for all intents and purposes is a third hand, I'd say yes. Thats probably a DM ruling, however.
Immeadiate actions happen on anyones turn, but I'm asking if they interrupt readied actions. For instance, if a Dire Badger claws my level 1 Conjurer as a readied action, can I Abrupt Jaunt away?