It just upgraded all my home macs to Mac OS X 10.3.9 which also includes a new version of Safari 1.3. It seems that the first time you run the newly installed Safari some standard bookmarks are created on your bookmark bar. These include bookmarks to news, .mac, apple.com, yahoo.com and a few others.
This is bad form by Apple. These standard bookmarks should only be created for a new installation and not for an existing one.