I like to look back at things, when I have time. Google has published their 2013 Zeitgeist at google.com/zeitgeist.
It is obviously a nice way to look at all the keywords you may have missed out on. But obviously, you should not be targeting keywords just for traffic, but rather conversions. Most savvy SEOs I know can turn lots of traffic into conversions, despite the keyword. But that being said, here is the video Google released to sum up 2013.
Controversy on what Google selected to show in the video? Of course.
Forum discussion at Google+.