d21lewis already informed you of the free videos.
However "The  3D Machine" Video can now also be bought in the e-Shop for 1 €. Maybe they will add even more videos later.

I finally updated! The folders are quite helpful. I had a lot of Demos and Trailers downloaded and it made the scrolling really annoying to try to find something, much better now~!

You mean the Nintendo Video application? I already got that but it just shows videos of dinosaurs, Kid Icarus animation and other things I don't care about. I entered the shop channel yesterday but couldn't find any trailer that could be downloaded. A friend told me that was available sometime ago but not anymore, is that true?

If not which video is now available to download for free, anyone knows?

Still holding out hope for a complete overhaul to the Nintendo Network with accomplishments attached to your mii profile to compare across games with friends

No, you ninny! *slaps hand*  From time to time, they give you these trailers (or at least they did) that can only be viewed if you download them.  Nintendo usually makes a big deal out of them when it happens.  They are free but they disappear after a short time.  I deleted some, once but I was still able to download because they appear in my purchase history.  They don't really serve much purpose now because I own most of the games I want but the Trailers I have (In 3D, too!) are:

• Animal Crossing (Sept 30, 2011)
• Dillon's Rolling Western (Dec. 15, 2011)
• Kid Icarus 1st Trailer (June 7th, 2011)
• Kid Icarus 2nd Trailer (Sept. 30, 2011)
• The Legend of Zelda Ocarina of Time 3D (June 7, 2011)
• Luigi's Mansion 2 (Sept. 30, 2011)
• Mario Kart (before it was called Mario Kart 7!)(June 7, 2011)
• Mario Kart 7 (Sept. 30, 2011)
• Mario Tennis (Sept 30, 2011)
• Metal Gear Solid: Snake Eater 3D (June 7, 2011)
• Paper Mario (Sept 30, 2011)
• Resident Evil Revelations (June 7, 2011)
• Sakura Samurai (December 15, 2011)
• Starfox 64 3D (June 7, 2011)
• Super Mario 3D Land (Sept 30, 2011)

None of them are available now but a lot of VGChartz 3DS owners got them because I see them looking at them sometimes.  Each trailer had its own square on the home page like it was a full fledged piece of software.  They were good for seeing what a game would look like on your 3DS--better than the videos on the eShop, too.  They aren't "Must see" videos, though.  Just gameplay footage, most of the time.   I bet many of them are on the Wii's Nintendo Channel, still.

Hmmm, well I started to play the 3DS in October so it makes sense I missed a lot of those videos, but I'm pretty sure I looked for Dillon's Rolling Western and didn't see any option to download it.....  =/

Probably my mistake, I don't think it has anything to do with the Region, thanks anyway :)