Here are some interesting news articles from the second half of October.
ECMAScript 5 is going to be supported by IE 9 and other future browsers, here is an article describing some of the more useful changes: http://blogs.msdn.com/b/ie/archive/2010/10/27/ecmascript-5-part-1-reusable-code.aspx
YUI announces that there is a security exploit in the SWF files released with various versions of YUI 2. If you use chart.swf, swfstore.swf, or uploader.swf, you should replace those files immeidately: http://www.yuiblog.com/blog/2010/10/25/yui-2-8-2-security-update/
Mootools More 1.3 has been released (following the release of version 1.3 of the core library): http://mootools.net/blog/2010/10/29/announcing-mootools-more-1-3/
Not using GIT yet (I hope you are using some type of version control)? Here is a good article from A List Apart discussing how to get started with GIT: http://www.alistapart.com/articles/get-started-with-git/