It seems apple has released Security Update 2007-009 v1.1, as it just came in via System Update for me. The update apparently addresses an issue with Safari that was introduced in the initial v1.0 release.
From Apple:
Full Details: http://docs.info.apple.com/article.html?artnum=307224

From Apple:
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. The security content of Security Update 2007-009 and Security Update 2007-009 v1.1 is available here
Security Update 2007-009 v1.1 will install over Security Update 2007-009, and its installation is recommended to resolve the Safari issue.
Systems that have not yet installed Security Update 2007-009 only need to install Security Update 2007-009 v1.1.
Full Details: http://docs.info.apple.com/article.html?artnum=307224