Ran across this today, looking for alternate ethernet chips for my furnace (boy, that doesn't get old... ethernet furnace... ethernet furnace... ;)
http://www.silabs.com/tgwWebApp/public/web_content/products/Microcontrollers/Interface/en/CP220x.htm
This is a 48-TQFP (0.5mm pitch) chip with an 8 addr 8 data standard "parallel" MPU interface on one side, and a simple twisted pair interface (i.e. direct to an rj45 with integrated magnetics and LEDs) on the other side.
On a similar vein, and in a package that's easier to solder:
http://www.microchip.com/stellent/idcplg?IdcService=SS_GET_PAGE&nodeId=1335&dDocName=en022889
HTH,
JDB. [who's just come across the part; no personal experience. Yet.] -- LART. 250 MIPS under one Watt. Free hardware design files. http://www.lartmaker.nl/