I've been busy lately playing with my new (real machine!) A500 I finally bought after so many years of emulation only...
Soon, I also tried TCP/IP with AmiTCP and SLIP, but with only 9600 Baud it was no real fun... A bit of searching on Aminet revealed magPLIP that uses the much faster parallel port for data transfer. The only drawback was that I need to find a peer that still has such a port. Most current PCs don't

I had the idea to use an Arduino 2009 board as a bridge between the Amiga and the PC for a fast internet link. The parallel port was directly connected to the I/O pins of the ATmega controller and I implemented the magPLIP protocol there. The serial/USB link of the Arduino is very fast and I use this one to transfer the data packets over a 500000 Baud Link via SLIP to the PC.
This experiment worked very well and as a result the plip2slip project emerged. Today I released the first public version 0.1. Just visit my plip2slip homepage for download and details:
http://lallafa.de/blog/plip2slip/I think this is a nice little project to add decent internet link speed even to your classic Amigas without too expensive hardware.
I hope you enjoy it and I always welcome feedback!