The RIAA, preferring to shoot first and ask questions later, has gotten a lot of bad press over their thousands of lawsuits. Many of the suits end up being filed against innocent people, and mostly recently a case in Chicago has been dropped for just that reason. A suit filed against Lee Thao alleged that he was illegally sharing music, just like every other RIAA suit. It probably came as quite a surprise to him, because the dates given on the suit were before he even had service at that particular ISP. It's somewhat hard to download music from the Internet without an Internet connection.
For as much as the RIAA lawyers must be getting paid, you'd think they could spend a few minutes researching their targets before blindly tossing a lawsuit at them. Hopefully, innocent people will not cave under legal pressure just from intimidation.