A rainfall of Security updates from Apple

Apple has just posted a security update 2008-007 via the usual software update or via direct download for: Leopard, Leopard serveur, Tiger Intel, Tiger PPC, Tiger serveur PPC and finally Tiger serveur Universal.
10.5.5 and 10.4.11are the minimum requirements

Security Update 2008-007 is recommended for all users and improves the security of Mac OS X. Previous security updates have been incorporated into this security update.