Thanks to Ellie Young of USENIX for passing this along:

The SCO Group, Inc. (SCO) has recently sued IBM and Novell and launched broad attacks on the legality of and the economic justification for so-called open source licensing, including the free licensing of Linux. (see http://www.osaia.org/letters/sco_hill.pdf) As an organization dedicated to advancing the skills and contributions of computer researchers and developers, the USENIX Association is compelled to address and refute the position SCO has taken regarding open source software.
Usenix will be sending this letter to Congress and the press.