One lawyer has the idea. This lawyer was able to fend off the RIAA with a wordy, yet convincing, letter. The letter, basically, says that the RIAA has no evidence other than the IP address. Sample of the letter:
In an age of Wintel-virus created bot-farms, spoofs, and easily cracked WEP encrypted wireless home networks (among other easy hacks), the only tech-savvy response to such a request is, "You've got to be kidding." The extensive press that has been generated over computer security (and the insecurity of Windows XP and its predecessors) underscores the complete absence of facts on which probable cause to sue my clients could be established and your clients' willingness (even insistence) that others be implicated in Big Music's speculative, "driftnet" litigation tactics.I like how they incorporate the fact that all the RIAA has ever had is the IP address, and they live on the fact that many people think that that is essentially your name, which it is not. The letter also incorporates the insecurity of Windows and a hijacked machine as the possible cause. This is the lawyer you want if you get sued.