Are you a forgetful sysadmin like me? You may be interested in this little Powershell script that I found in the Scripting Repository. It's been written by the official Scripting Guys and tested on 2008 and 2008R2. You can schedule this as a task to run once a month, before Patch Tuesday.
See this link for the details of the script:
http://gallery.technet.microsoft.com/scriptcenter/fd39c7d4-05bb-4c2d-8a99-f92ca8d08218?SRC=Home
If you found this post helpful, please give it a "Helpful" vote. If it answered your question, remember to mark it as an "Answer".