I run a small gaming website and have had good relations with ArenaNet and managed to get into this beta weekend. I have yet to be told what I can and cannot show but, post your suggestions here for videos and I will update the thread with them on Monday.
I did a similar thing on reddit and a few of them wanted particular skill videos for the Guardian and Thief, someone here might have some use out of them. PvP videos and then my written preview/impressions are the next things on the list.
Guardian - Tome of Wrath Elite Skills Video
Thief - Stealth Weapon Skills Video
Warrior - 1v1 vs Thief