Yup, a SDK with an extended Geek-kit would be great. As the eDGe use the Marvel pxa 168 processor, a geek-kit with all the usable function calls and examples would be great.

The pxa 168 supports the following (among other things directly in "hardware"):
CPU rates up to 1.2Ghz
Video: H.263, H.264 BP and partial MP, MPEG-1/2/4 ASP, M-JPEG, WMV9, Sorenson, On2
Audio: MP3, AAC, WAV, WMA9, SBC, MIDI
Image: PNG, GIF, BMP, TIFF, JPEG
Middleware: OpenVG1.1, OpenGL-ES1.1

This together with the 512Mb of ram makes the eDGe a unique device.

Get some enthusiasts to get "dirty" with the code and start tweaking the platform, that could lead to some great advancements.