Standard HD44780 LCDs are useful for creating standalone projects.
For more information, check out our detailed step-by-step Arduino+LCD tutorial
We have a generic 20x4 datasheet that has dimensions and pin-locations (the exact model may vary but the pinout, size and protocol information is the same). We also have a HD44780 datasheet with the detailed commands for control
See our Distributors page for a complete list of distributors.