A Duluth MN file sharing case brought (and won last year) by the RIAA was the only trial of its kind of make it to court; and it set controversial precedent for what is considered a copyright violation. (Namely, files exposed to a file sharing network would be enough. Proof of files copied would not be necessary.)
Today, a mistrial was declared on that case.
blog.wired.com/27bstroke6/200...