This is a shield that provides a lot of flexibility in adding Ethernet/Internet connectivity to Arduinos. You can use either an XPort module
or a WIZnet module as the 'engine'. Both modules have pros and cons, so you can decide which is better for you.
Please note that this item does not come with the module, they are sold separately (see below)
One option is you can go with a XPort, XPort direct, or XPort Direct+. These are older and possibly more familiar to some people. There is a lot of example code for the XPort, and one of the benefits is that it has a preassigned MAC address & has built-in DHCP. That means its easy to plug in your project into a new network without having to reconfigure it or mess with a router. The XPorts use serial protocols to communicate, and are best for straight-up Internet host or client setup. However you can only have one connection at a time. For an analysis of the different XPort modules, see this comparison sheet (from GridConnect).
Another option is the newer WIZnet 811MJ module, based on the W5100 chip. The WIZnet module is compatible with the official Arduino Ethernet library, which is easy to use and very powerful. However it does not have DHCP built-in which can make setup a bit frustrating if your network isn't friendly.
The kit does not include an Ethernet module! You can buy XPort modules for $28-$50 from GridConnect, Mouser, etc. WIZnet modules can be purchased here in the Adafruit shop for $25. Check the online bill of materials for a list of what is included.
This shield is not designed for WiPort or Matchport modules (wireless 802.11) or other ethernet modules such as Rabbit, etc.
Lots of examples, instructions and demo sketches over here!
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