DSerial Edge Pre-orders are now available on Electrobee. The DSerial line of devices plug into slot-1 of your DS, and allow you to easily interface with various kinds of electronics and hardware. They are designed for people who want to use the powerful Nintendo DS to control electronics projects, or to plug interesting new devices into their DS for use in homebrew.
New features of the DSerial Edge versus the previous DSerial1 & 2:
Boots NDS files from microSD and high capacity microSDHC cards
Complete SLOT-1 solution (don't need anything in SLOT-2, no swapping carts)
2 x UART serial ports (compared to 1 x for DSerial2)