The long-awaited X 10.5.2 is available and so is the 1st security update of the year. It is available for download for Tiger (client and server, PPC and Intel) - but is included in the X 10.5. 2 (Leopard). It also contains the last 2007 update.
The update "Security Update 2008-001" is recommended for all users. It improves the security of Mac OS X. This update also contains security update "Security Update 2007-009".
For more information on this update, please consult the following website:
http://docs.info.apple.com/article.html?artnum=61798-fr (french)
http://docs.info.apple.com/article.html?artnum=61798-en (english)
[translation by jeremy]