I would like to have a rapsberry pi bridgeboard.
I thought it out many times, and it could be doable by linking hardwarewise A serial (rs-232) Amiga expansion with the GPIO pins of the raspberry (which could hold itself an rs-232 adapter). A null modem connection in esence.
Softwarewise, they could use some existing network solution (VNC, SMB, etc).
I'd like to see something similar, an adapter that uses the raspberry pi as a daughter card. It could plug in the way a bridgeboard does and emulate a 486. It could also transparently provide access to the USB and network for the amiga side, or even memory. Or it could plug into the CPU slot, and emulate a 68k CPU upgrade or even a PowerPC.
I'm not sure if the gpio port is fast enough for CPU or memory usage by the amiga, but it should be fast enough for ethernet, usb, and disk.
brian