I think you're looking at last year's list - from 2013... I made the same mistake, thinking that it was like taxes, and a year behind. The voting is actually still open for this year's 'Best Of' lists and the link to cast your votes is here:
http://www.nhmagazine.com/Best-of-NH/ 
Oh, and you can write in any of your favorites if they aren't on the list!