Here’s a project by Everett Robinson which demonstrates how to use an Arduino, Ethernet shield, 2×16 LCD, a breadboard and 2K resistor to produce a web-controlled interactive LCD display. The Arduino generates a simple HTML web page showing the text currently displayed on the LCD, providing an input form to change the LCD text, resulting in a web based LCD scratchpad. The Arduino parses the HTML Header using some code adapted from Kevin Haw’s RoboSapien Server project.
You can view the source code here.