Arduino Ethernet or ethernet shield

Hi Everyone!

I have an arduino board like this one http://arduino.cc/en/Main/arduinoBoardDuemilanove here.

I would like to build a servo motor control over internet with my arduino panel and an arduino ethernet / or just ethernet shield board.I would like to buy it, but i don't know which one is better, and what is diffrence between arduino-ethernet and anrduino-ethernet-shield, or ethernet-board is compatibile with my board ?

I know i can send data to motor with ethernet panel, but can i also receive data from motor to computer over internet , and after processing it send data back to board ?

( I am sorry for my English )

If you want to control something over the internet you will want an ethernet device of some sort. You can get Arduinos with ethernet built-in. Since you already have an arduino you might as well keep it and get an ethernet shield that simply plugs into it.

Note that many ethernet shields have an SD card included.

Ervin:
but i don't know which one is better

Better is entirely subjective

Ervin:
and what is diffrence between arduino-ethernet and anrduino-ethernet-shield

Arduino-Ethernet is an Arduino with the Ethernet chip on board. It is the same hardware used in the shield. The trade off is that Arduino Ethernet does not come with an on-board USB to serial chip. So you must use an external cable to program the board. (It is not programmable over Ethernet.)