I, too, would like to have seen Roger [edited later, sorry about the mixed up identity!] include the Exped Schnozzle (sold with the Exped UL7 Downmat or can be purchased separately for other Exped pads) in his review. I believe it has been around for at least 2 years now. I understand that it works as a pack liner, too.
I have the BA pump sack [mentioned by Anthony] and found that it is useless for anything except blowing up an air pad or to use as a non-waterproof (and therefore useless, IMHO) stuff sack. It is most definitely not waterproof! I suppose you could use it as a leaky shower, but a wet bag is not what you want for pumping up an insulated air pad. It doesn't hold air, either, so is useless as a pillow (its other advertised purpose). Like Victor, I also use a plastic trash bag to pump up my insulated air pad.