If you followed my guides in the past, you've probably seen a few of my videos. Generally, I make a video for difficult quests, because it's simply easier to show how to do it than to describe it with words sometimes.
In the future, I'll be using videos more often to show how to do difficult quests, like soloing certain elite quests in my Wotlk leveling guides. But I'll also use videos for my class specific leveling guides, to show you how to get the most out of your class and explain certain mechanics.
Anyway, here's the first video of a long series of videos to come, it explains how to AoE stuff as a Death Knight and it will be part of my Death Knight Leveling Guide in the future (this is just a preview version though, the final video will be in high quality and be more polished).
You can view it on my blog: Video - Death Knight AoE Killing - Basics
Latest Video: Death Knight AoE Grinding - Zero Downtime