I haven't tried gps lite so I can't give you a good comparison, but I use MotionX GPS and am completely satisfied with it.
Thanks for the app suggestions, I'm looking into them.
I don't think anyone mentioned journaling. I have an old Palm folding bluetooth keyboard that I use with the iphone for journaling. I like to be able to make notes, lists and journal entries that I can then post directly from the phone when I find reception. At 8 ounces, it's a severe weight penalty, but I understand there are much lighter ones now.
I certainly agree that with calculator apps available, a smartphone is a better choice than a stand alone calculator.
By the way, Star Walk computes sunris/set. No need for an extra app.