Arduino drives 4-row I2C LCD from Robot Electronics
I've hooked it up to an Arduino; it's easy to drive and looks very professional.
I stumbled across Robot Electronics while searching for LCD suppliers.
It turns out that they are the on-line trading arm of Devantech, whose Ultrasonic Rangers are widely used in Robotics Projects.
Their full range of products is much wider than that, and their on-line shop is well worth a visit.