YouTube.
If you get your keywords right, hit that low hanging fruit, and if you're prepared to put the work in to dish out enough videos as it takes to sort of "blanket bomb" as many keywords as you can cover within reason, and provided the video it's self is either intriguing enough or resourceful enough to garner clicks from viewers by pointing them to the description of said video...
Then you can get a fair bit of traffic from YouTube.
It takes time, It's not hard to do, you can even use their slide-show maker which is built right into the platform, but it's tedious as hell. Worth it however, if it's something anyone feels they could give a solid try for.