Lol, yessum, we all know that - I have several A1200s and even an ACA630 equipped A600 using a pcmcia Ethernet solution.
However, this is not a solution for the A500 and A1000. It is a Phoenix equipped A1000 that I was intending to do this to.
It's gotta be slow, but plausible. For FTP it could be a way to connect up machines. But not very practical. I guess hi-speed serial would make it a little more attractive.