I started a tradition in 2010 and 2012 that I am just barely keeping alive (posting on NYE 2013!). Just like last time, I emailed out the write-up to people I've got email addresses for. So if you aren't on that list, you can check out the update on my 2013 in Retrospect page.
A lot definitely happened in 2013, and the update is, once again, lengthy. But it should read quickly and give a pretty good overview.