Massively is having a vote today between my two favorite F2P MMOs: Lord of the Rings Online (LOTRO) and Star Trek Online (STO). I enjoy them both tremendously, as I think both have created compelling stories and fun content based on their respective universes, so I decline to vote one over the other (though frankly, I play LOTRO a bit more than I play STO).
If you want to cast a vote, go here.