Everyone I talk to that has seen it says that Ju-on blows Ringu out of the water as far as Japanese horror flicks go. I assume there's even scarier movies but Ju-On looks pretty scary.
There's another thread about it here:
http://www.tfproject.org/tfp/showthr...threadid=62400
How cool is it that the director of the original is going to be directing the Hollywood version, with Sam Raimi as producer? I saw the trailer for the American version in the theater and it looks pretty intense.