Apple released Security Update 2007-007 today.  The Intel version of this update 26.6MB and according to Apple:

Security Update 2007-007 is recommended for all users and improves the security of the following components:

bzip2
CFNetwork
Core Audio
cscope
gnuzip
Kerberos
mDNSResponder
PDFKit
PHP
Quartz Composer
samba
WebKit
WebCore

Security Update 2007-006 has been incorporated into this security update.
For detailed information on this update, please visit this website: http://docs.info.apple.com/article.html?artnum=61798

A reboot is required after the update.

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