Check the News forum here on CB for the Gauging iPhone App Interest thread. It costs only a couple dollars and though it's still very basic, it makes posting very easy. I have no real complaints about it, though a couple suggestions. According to Dave, he's already planning an update to the app.
Personally, having my iPhone gives me more time that I don't need to spend at a computer and now with the app, I don't need to worry that I'll have fewer opportunities to skim the posts and make replies. I highly recommend getting it.
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