Crashmo has a neat little feature that will mark the beginning of in-house QR code support. When loading up a custom QR level in Crashmo, you can visit a website within the 3DS browser, save an image, and load it up in-game.
Previously, you had to take a picture of the code with the 3DS' camera with the aid of a laptop/smartphone/printed paper or what have you. Now, it's a tad bit easier, which should help those people out there who don't have easy access to a PC.
Essentially what this translates to is another confirmation of more free DLC, in line with Pushmo -- it's just easier to obtain this time. Cool little things like this make me excited to see what Nintendo can bring with the Wii U.