Groklaw is a blog covering the legal aspects of the ongoing lawsuits brought by The SCO Group against various companies promoting and or using Linux.
SCO v IBM
When The SCO Group sued IBM in order to stop Linux distribution, as well to seek money for "licences", a large body of Linux users, developers, vendors, and technology consultants were surprised. Most were unaware of any potential legal infringements.
Pamela Jones steps in
PJ, as she is known by her Groklaw handle established a the weblog, where she has been able to use her job as a paralegal to dig up information. The website Groklaw  has become immensely popular with about 5,000 registered users, plus thousands of anonymous hits daily.
A large body of research has been performed by contributors. This reservoir of valuable details has been accessed by both SCO and IBM legal staffs, and has in some part shaped the on-going nature of the conflict.
A collaborative online project has been created in May, 2004, named Grokline , to document the UNIX and Linux development history. As of this writing the website is only a couple of days old. Ultimately it will produce the clear pedigree of Linux developments, and document the Public Domain portions in TSCOG UNIX. This will greatly simplify the legal process by weeding out all the public domain, or legal original contributions to Linux and weeding out all the unprotected Public Domain portions in UNIX. When the smoke clears, it is expected there will be very little code on SCO's side to argue about, and none of that will be found in Linux.