I'm assuming you're looking for specific information regarding the Japanese version and not the US remake?
I haven't seen the Japanese one in about two years, but I recall there being a cop character (played by one of the Crazy 88's from KILL BILL) whose storyline, at one point, overlaps that of his daughter, who I believe died from the curse. He's planning on burning down the house, and overhears her and her friends in an upstairs room, only the sound is coming from a different point in time. She bolts down the stairs and seems to look him straight in the eye, although the two of them are in different time zones. I found that rather cool.
The biggest conceit of both films is the way in which they play with the continuity, sort of working backwards through the events a la MEMENTO, with each "sequence" chronologically preceding the one before it. I think the Japanese version does it better than the US version, but the US version has more cheap shocks.
Probably doesn't help much, but hopefully it's a start...
Good review over at midnighteye.com
http://www.midnighteye.com/reviews/juon.shtml