If you are still curious about this, I actually wrote a tutorial for converting from PAL > NTSC (or vice versa) on my blog:

http://rcamp.name/blog/?p=18

I would just copy & paste, but I have screenshots on the blog post that will be helpful. You need to rip the DVD to your hard drive for this to work; I didn't cover those steps in my tut, so if you need help with that, just let me know.