Another option that may be of interest is a Triscend E5 Configurable System-on-Chip (CSoC) connected to a Cirrus Logic CS8900A 10Base-T Ethernet MAC.

The following links show the relevant application notes and reference designs.

AN30: Interfacing the E5xx to an Integrated Ethernet 10Base-T MAC/PHY
http://www.triscend.com/products/an30.pdf

RFD-01: E5+Ethernet
http://www.triscend.com/products/updates/cs8900A_I2P.zip

There is also a development board available called the iKit2000, which has a daughter card containing the CS8900 Ethernet chip and PHY. Details are available via the following link.

http://buy.allamerican.com/ikit2000.html

The IKit2000 board also includes the Triscend FastChip development system.

The reference design uses the CMX MicroNet TCP/IP stack, which runs on the E5's embedded 8052 microcontroller.

CMX-MicroNet
http://www.cmx.com/micronet.htm