Microsoft published the December CTP of SQL Server 2005 SP2 on the web on December 19th.  Find it at http://www.microsoft.com/downloads/details.aspx?FamilyID=d2da6579-d49c-4b25-8f8a-79d14145500d&DisplayLang=en

This update replaces the November CTP located at http://www.microsoft.com/sql/ctp.mspx.  Read Paul Mestemaker's blog post about it here: http://blogs.msdn.com/sqlrem/archive/2006/12/19/SP2-Dec-CTP.aspx

Enjoy!

-Kevin