I think adding video content will just add clutter to the site. Why not instead add a couple of screenshots to each entry? That way we can keep all content local and not rely on other pages like youtube
In-game screenshots as a preview is also a good idea. I didn't just say get videos from YouTube, I mentioned that we could upload videos here ourselves but meh, Rayne was right. However, I do like the screenshots idea to compliment game descriptions or box text. This is why I post suggestions - someone may add to it or look at it differently and create a better suggestion.
Besides, I think it would be super-easy to implement, just reuse parts of the same code used for displaying Front box/Back box, Cart but put it on the right side of the entry and let us show 3 different in-game screenshots