There are many videos, not just on the front page. Each game page may or may not have a gameplay video or other related videos, for example.
But on the front page... hmm...right now I count 40 videos, plus one digest video. 17 videos are third party, meaning 23 are first party. First party videos go from Wii fit and Mario Kart as far back as Animal Crossing: WW, and third party videos start at We Ski and Deca Sports, through Ghost Squad, Disney Friends, Boom Blox, Trauma cenrer 2, Hannah Montana, and more.