It's uncanny. When known software gets repackaged for iPhones and iPod Touches and passes through the hallowed gates of the App Store, something happens: Almost invariably, it gets cheaper. Waaay cheaper. Good right? Well, not always.

People bitching about TomTom's $100 iPhone navigation app can either a) bitch louder or b) download MotionX GPS Drive by Fullpower. It's $3 per month or $25 per year, and it works just fine.

Possibly in response to the amazingly low price of Fullpower's MotionX GPS (stay tuned for full review), Networks In Motion has reduced the monthly rate of its Gokivo iPhone app to $4.99. [iTunes Link]

When I published the turn-by-turn navigation app battlemodo, many readers asked me to evaluate some other popular choices. Because everything I do, I do for you, here are CoPilot, GoKivo and Sygic, a.k.a. the best of the rest:

Today people were shocked to discover that the first turn-by-turn navi iPhone app to hit the iTunes App Store cost $9.99—per month. Well, get used to it, because there are a lot more subscription apps coming.

Bad news: the first app to use in-app pricing in the App Store is a huge ripoff. Gokivo, is a $1 turn-by-turn directions app. Want to actually use it? That'll be $1/minute, $3/10 minutes or $10/month. Updated.