Mac OS X Updates:

• http://www.apple.com/downloads/macosx/apple/macosx_updates/
• http://www.apple.com/downloads/macosx/apple/security_updates/

Safari:

• http://www.apple.com/safari/

Firefox:

• http://www.mozilla.org/security/known-vulnerabilities/
• http://www.mozilla.com/en-US/firefox/all.html

Flash:

• http://kb2.adobe.com/cps/142/tn_14266.html

Shockwave:

• http://get.adobe.com/shockwave/otherversions/

Java:

• http://java.sun.com/javase/downloads/index.jsp

QuickTime:

• http://www.apple.com/quicktime/download/

Flip4Mac:

• http://www.microsoft.com/windows/windowsmedia/player/wmcomponents.mspx