Any website you visit will have a record of your IP address. But it takes a court order for LE to obtain this information. When it comes to torrent files, what you are downloading from the torrent site is just a tracking file, it is not the file itself. The file itself is downloaded from hundreds of different systems on the net at the same time, diffferent bits from different systems. Some sites, such as releaselog, do not even host the torrent file but instead include a search link to help people find what they are looking for.
Unlike the original Napster program which used centralized servers to coordinate all the downloads, there are no servers involved in torrent downloading, only the client program you choose to use. This makes it almost impossible to stop and very difficult to prosecute anyone for using it.
The only people who really get targeted by LE are those who are routinely seeding large quantities of copyright protected material. The average file sharer really has nothing to worry about.
There are programs available to hide your IP address from outside eyes but in general they are not necessary here in Canada.
This link from my original post on torrents is a very useful guide. Some things may be outdated though, I haven't checked if it has been updated.
http://btfaq.com/serve/cache/1.html
One thing to note...Sympatico, and many other ISPs, currently limits download speeds on torrent connections between 6 PM and 2 AM. The download is capped at around 35Kbps. So if you seem to be getting lousy speed and find it takes forever to get what you want, just leave your system running overnight and you will often find the dl has finished when you check in the morning.
Some things, such as complete seasons of a TV show like the X-Files for example, can take days or even weeks before they complete. Don't worry about it. Sometimes it takes a while to get what you want. Older movies and shows may have few seeders uploading the file.
Anyways...don't get paranoid about it. Have fun and don't forget to seed what you leach.
Techman