The IP address just points them in the right direction. They still have to find your location and confiscate your computer before they can prove any wrong doing. If you stay within the law you have nothing to worry about. Heck I even use my real name and say what town I live in. Wouldn't be real hard for almost anyone to locate me. Have nothing to hide so no reason to be paranoid.
Agreed. Use your neighbor's computer for all the shady stuff