There is a last modified daye on the FAQ as of the begining of January. It also notes a little "new" color changing icon up to a week from the change. This code is also in the Developer Info and Geek Guide as well. I wanted to get a page done that would show the last X changes to the FAQ so that people could keep up with it even easier, but I haven't gotten around to it yet. (I'm currently working on a small backend for gallery requests).