December 2007 security patches
SANS have done a great job with getting info out about the patches released this month - I love the table they have put together - so let's just point straight to their page this month :o)
http://isc.sans.org/diary.html?storyid=3735
Note there are updates affecting versions of Internet Explorer all the way back to 5.01 on Windows 2000, and even IE7 on Vista and Vista x64.