I recently reviewed the November OUCH newsletter for SANS. Bill Wyman put together an extensive list of commonly installed software products (and the patch sites for each). I thought it would be helpful to share this with readers. This is used with permission. If you do not subscribe to the SANS OUCH newsletter, I encourage you to do so. Yes, I am a reviewer. Here are the links to patches for these commonly encountered systems.
Windows: http://update.microsoft.com and http://www.microsoft.com/security/updates/bulletins/200910.aspx
OS X: http://support.apple.com/kb/HT1338
iPhone/iPod: http://docs.info.apple.com/article.html?artnum=305744
iPod: http://support.apple.com/kb/HT1483
Acrobat Reader: http://www.adobe.com/downloads/updates/
Adobe Flash Player: http://get.adobe.com/flashplayer/
Firefox: http://www.mozilla.com/en-US/firefox/update/
Safari: http://www.apple.com/downloads/macosx/apple/application_updates/safari.html
Opera: http://www.opera.com/
Google Chrome: http://googlechromeupdate.com/updates.html
Java: http://www.java.com/en/download/manual.jsp
iTunes: http://www.tuaw.com/2009/09/22/itunes-9-0-1-now-in-software-update/
Symantec: http://service1.symantec.com/SUPPORT/sharedtech.nsf/docid/2002021908382713
Norton: http://www.symantec.com/business/security_response/definitions/download/detail.jsp?gid=n95
McAfee: http://www.mcafee.com/apps/downloads/security_updates/dat.asp
Kaspersky: http://www.kaspersky.com/avupdates
Sophos: https://secure.sophos.com/support/updates/
Panda: http://www.pandasecurity.com/homeusers/downloads/clients/
BitDefender: http://www.bitdefender.com/site/view/Desktop-Products-Updates.html
Microsoft Security Essentials: http://www.microsoft.com/Security_Essentials/
I would appreciate comments as to how helpful this list is to you.