Apple has updated Security Update 2007-009 to version 1.1.
According to Apple's support site:
Security Update 2007-009 v1.1 addresses an issue introduced in Security Update 2007-009 that may cause Safari to unexpectedly quit when browsing to certain websites.
There is no change to the security content provided in Security Update 2007-009
Security Update 2007-009 1.1 (10.5.1) - 35.6MB
Security Update 2007-009 1.1 (10.4.11 PPC) - 15.9MB
Security Update 2007-009 1.1 (10.4.11 Universal) - 27.4MB