There is an ethernet card that is supported by Linux that attaches to a parallel port.   It's pretty steep in price (around US$100+) though.   One of my buddies was considering buying it since his old XIRCOM parallel port wasn't supported.
Can't think of the name of it off hand but will look it up in a hurry unless someone already knows it and posts...
Parallel Port ethernet (Score:3)
Can't think of the name of it off hand but will look it up in a hurry unless someone already knows it and posts...