The most important thing to keep in mind is that WoW Insider is a PG-13 blog. We include some very mild language, animated video game violence, and almost nothing in the way of sexual content. While we understand this is a somewhat loose guideline, a bunch of cursing, nudity, and sex will push the video toward unpublishable here.
Any kind of racial, gender, or other slur will result in an instant disqualification. This includes any kind of ugly language. Yes, something may have slipped by us in the past 8 years, but this is our most strict guideline. Anything mean-spirited is something we just don't run; that's not what WoW Insider is about.
We feature machinima, music videos, live action videos, and even gameplay videos. Slideshows don't tend to make it, but that's not a strict rule. We tend to look for things that are enlightening, entertaining, or educational.
To get your video on WoW Moviewatch, someone needs to tell me about it. I follow a lot of feeds, know a lot of people, and do my best to go out looking, but the best way to be sure your video comes to our attention is to drop us a line on our contact form. I usually reply with my personal email address, and you can feel free to email me in the future.