I believe it costs $100 but I got it for free. I went to the Affiliate Summit in Vegas this past January and Real Networks was giving the software away from their booth. I was elated!
But Pinnacle is really best for movie editing. Say you have a series of videos from your camera and you want to turn it into a movie with music, effects, etc.
If you just want to convert your movies into a format for YouTube then I'm sure there's cheaper conversion software out there. I just use Pinnacle 'cause it's all I have.