The main topics of these videos are : Pathfinding, Mind control & Plants/mining.
Regarding pathfinding, as stated by Switchblade, a video of Nostalrius Begins already exists
hereFor
Plants & Mining, it's true that this is another advantage of the server : we added mechanics in our system to handle plants & mining in a Blizzlike way more than 2 years ago. It helps to balance economy and enhances PvP activities. We'll maybe do an english video about this topic later.