Thanks to everyone who posted--glad to know it's not just me!
I have noticed that the iTrip definitely seems to use up my battery pretty fast, but again, I thought it was just me.
To be quite honest, I'm not very impressed with the iTrip thing. There are
no suitable radio stations around here to use it with (I know, 'cause I've been playing around with it some more). My boyfriend got it for me because one of his friends has one and apparently likes it pretty well, but I don't know...guess that guy's just lucky, 'cause mine just doesn't work all that well. Guess it's back to lugging around my big case full of CDs whenever I go anywhere in the car...