Alas, no its server only I'm afraid.
I have a Wiznet shield on the way, once I have had a play with that, I think I might try and make an interface to the ENC28J60 that mirrors that 'standard' interface.
The ENC28J60 shield I got was actually really good, with a nice little prototyping area (big enough for a couple of MOSFETs). It just needs a software update.
I'll post it up when I get round to it.