For anyone interested in ENC28J60, I just put up some notes on the custom board I've been using, here on Arduino Ethernet Using ENC28J60 | maniacbug . Thought it would be more interesting to people here than in 'project gallery' which could be about anything.
RF Ethernet Maniac V1 Photo by maniacbug, on Flickr
Have you seen the ENC28j60 board that is Arduino shield compatible here ?
Worth contacting them if you want to collaborate on ENC28j60 software.
For another "worked example" based on a 28J60, see...
... a small webserver running in an old Arduino clone with only 16k of program memory. Cost of clone and ethernet shield: About $40