Here's a bit of interesting reading: How Not to Get Sued by the RIAA for File Sharing (and other Ideas to Avoid Being Treated Like a Criminal).

Nervous that you might be next on the RIAA's hit list? Check out The Electronic Frontier Foundation's Subpoena Query Page to see if your username is listed on one of the subpoenas filed with the D.C. District Court.

@#%$ RIAA.