I've been told using the compact Macs are an
exercise in futility. But
 what about the Mac II's? (original II, IIx, IIfx, IIcx).
  I was just curious. 
 An SE or SE/30 can accept an ethernet board.  They're kinda rare, but
 they're out there. 
 
 Or something I've used with an old 68030-based mono Mac laptop - a
 SCSI<->Ethernet box.  It's been 10+ years since I used one, but I
 think mine was made by either Dayna or Asante.