This is why you haven't seen any Denshimail for a while.
The stuff you've seen:
Episodes 1-6
Wii Launch Day Special
Tokyo Game Show 2007 Special (and extras)
Video Netcast Promos
The stuff you haven't:
Director's Commentary for Episodes 1-6
Convention Tour 2008 Special
Bloopers, Alternates, and Deleted Scenes
Easter Eggs
You want it? You got it!:
http://www.famicomdojo.tv
You're watching a POWETcast; a video netcast by Powet TV. Chell it: http://www.powet.tv/
