On May 20, Nintendo will put an end to DS and Wii Wi-Fi Connection functionality, and with it the last Nintendo-sanctioned method of transferring WarioWare D.I.Y. wares for distances of over 65 feet. Before that happens, let's make and swap as many microgames, records and comics as we can!
Items in your warehouse are available to download for everyone you've mutually swapped friend codes with, but I'd appreciate notifications of anything made specifically for the event! I'm also accepting submissions via Wii, along with .mio files from anyone with the means to make those. I plan to convert and archive all submissions as .mio files for posterity, and if this event takes off they could see release as the Glorious Trainwrecks WarioWare D.I.Y. Pirate Kart, which I'll worry about the logistics of later.
Potentially helpful tools
If you have a flashcart or access to your WarioWare D.I.Y. Showcase save file, a lot of extra possibilities open up:
miotool by yasu (Ctrl+F 'miotool' to find) allows you to transfer .mio files (representing games, records and comics) between your save file and computer. On the same page, mioedit (Ctrl+F 'mioedit' to find) can be used to edit a game's internal assets and presentation. I used it extensively for Eat a Baby!
CrygorTool is similar to miotool, but doesn't subtly inject the text 'yasu' into everything you run through it. May be useful if you experience issues with the above tools.
A combination of DeSmuME and LICEcap has allowed me to make some pretty sweet microgame GIFs. But if this process is too tricky for you, I'd be happy to make GIFs of your submitted microgames on request.
Tips
In order to connect your DS to the internet, you'll have to access a router using WEP encryption, an outdated encryption method that you are almost certainly not currently using!
In the DS version, your friend code can be found (after connecting to the internet at least once) under Distribution Centre > WFC > Friend Settings on the top screen. WarioWare D.I.Y. Showcase on the Wii just uses standard Wii friend codes, which you can add through the Wii Message Board.
Let me know if you have any questions and I'll try my best to add answers here!