"Online movie trading is skyrocketing, but onetime leader Kazaa is tumbling in use, according to a new worldwide survey of file-swapping traffic from network management company CacheLogic."
You can easily understand this. Bittorrent offers the stability that Kazaa just quite simply lacks. However, we lack a unifed search engine for torrent files, as far as I know.
Meanwhile, in related news, "Consumers might soon be able to make legal copies of high-definition movies, if a new coalition of media companies can reach agreement."