just Google on "Arduino ENC28J60" will get you to: tuxgraphics.org: An AVR microcontroller based Ethernet device
seen a single board layout where the ENC28J60 clock is used to run the Arduino, that's not what I'm trying to do...
There should be a way of running the ENC28J60 without interfering with the Atmel clock, which is how all these shields are doing it. The link at tuxgraphics replaces the clock with the clock out from the ENC28J60, which shouldn't be necessary.