I have one of these: http://www.retroswitch.com/products/flyer/
This gives my C64 full net access via serial for IRC & Telnet (also acts as a virtual 1541 disk drive) - would be great if one could be made for Miggy's! 
I've Asked Brandon if he could make a Parallel version for the Amiga but haven't heard back from him yet. :cool:
I hang in a channel with the guys who make these. they dont seem to have much interest in amiga anything.. seem quite short sighted. but it would be incredibly slow.
some of you might try the lantronix UDS-10, UDS-100 etc, they connect to serial and give ethernet.