Yeah... weird, I can't find the original thread either... It was a different product that was being discussed in that thread. That thread was about a super durable case for the iPhone and some video editing apps.
Personally I'm very happy with the RAM Mount iPhone cradle I've been using, and I shot a little video too, just to test it out. Sound is terrible, but I thought the video quality wasn't too bad:
As far as GPS apps for the iPhone, my two favorites are Harry's Laptimer Pro:
http://gps-laptimer.de/Home.html
Harry's Laptimer Pro is an incredibly sophisticated app that offers advanced data recording and is an ideal companion for amateur racing. Utilizing GPS, LapTimer will automatically start and stop your laps and sector times. With laps stored in a database, you can track your progress while improving your lap times corner by corner. Using your existing iPhone, LapTimer is an extremely inexpensive option compared to aftermarket standalone GPS laptimers.
MotionX GPS Pro:
http://news.motionx.com/category/motionx-gps/
Too many features to list- try the free "lite" version and you'll quickly realize what a powerful and well designed app this is! It can do everything a Garmin or TomTom GPS can do, and a lot more!