We've just released our new multi-function shield card: large LCD digits, piezo buzzer, buttons, RS-232 driver, RGB LED, and 13 additional I/O pins. Everything you'd need for a low power, easy to read, user interface.
And the best news: it only uses 4 pins (interfaced via the spi bus)! The Arduino libraries include easy to use functions such as:
lcd.display (cnt, 1, 1); // display the value of cnt on the left display with leading zeros
lcd.write ('T'); // transmit a T on the auxiliary RS-232 port
lcd.setRGB (128, 128, 128); // turn all three colors to half brightness
More details, including sample sketch, complete libraries, and schematic are at: http://www.pdksolutions.com/page13a.html