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. There's a 28-QFN version with multiplexed bus if you need it to be about 0.5cm square ;-) The only drawbacks are that it's a 3.3v part (no 5v option), and requires a 1:2.5 Tx transformer (less common than the 1:1). In my case, that translates into a different power supply (the m32c allows for split power, whew) and - unfortunately - the magnetics are limited to jacks that put the tab against the pcb, making it damn hard to get the plug back out again. I think I may be able to use non-integrated magnetics and a tab-up jack, though. Or I'll just put a big via under the tab so I cak poke it from behind ;-) Anyway, Mouser has these in stock for $4.42, plus an eval kit that combines the chip, an 8051 clone, and a jack for $20.