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Overview.

Note, that board of hw rev.02 has different numeration of chips and some other elements than previous one. To see changes look at TODO.txt

Separated power consumption: one 3.3v regulator for SD-card (IC2) and other (IC3) for enc28j60 chip.
Full size SD/TF card slot (users will can use an old fashion cards). It's placed on the PCB's bottom side.
Hardware implementation of MISO splitting from both devices (U1 on bottom side).
SSOP28 chip of enc28j60 (U2), same one is used on EthernetShield v1.0 for Arduino Nano board.
It can consume power from motherboard or supply one with power vice versa (J6).
There is a test point (TP) on up side of the board. It's dubbing a CLKOUT (pin3) of enc28j60, which provides 6.25 MHz when normal operates.
Interrupt and Wake-On-Lan are routed on pins 2 and 3 (J1).
MISO, MOSI and CLK signals are routed on ICSP connector (J5), as result - it can be used on UNO, Mega, Yun, Zero, Due and other Arduino boards which compliant to 1.0 pinout (now supported only 5v boards, hw rev.03 must implement support 3.3v).
There are 5 LEDs of different colors: 5v - red, 3v3s(SDcard power) - blue, 3v3e(Ethernet power) - white, 10M - orange and Link - green. When device operate it looks like Christmas Tree.
And main feature is that ICSP connector is through-holed and users get a real stackable architecture (more than one board with SPI interface over a motherboard): other daughter boards will can be placed over the board and work together.