_spPageContextInfo in SharePoint 2010/2013

I've used _spPageContextInfo several times over the last couple of years and never thought to blog it myself.  Someone finally had some common sense and decided to put fingers to keyboard and write-up some of the useful properties available on every SharePoint page via this useful JavaScript object.  Here's the link from Sahil Malik: http://blah.winsmarts.com/2013-2-_sppagecontextinfo_is_your_new_best_friend.aspx