An incomplete list of I2C devices types that you can interface to:

• LCD/LED drivers
• EEPROMs
• DACs, ADCs and IO expanders
• capacitive sensors
• real-time clocks
• digital temperature ICs
• accelerometers
• compass
• third party sensors with an I2C interface (sonars, IR range finders, NXT I2C sensors)

Did that get your mouth watering? You now have a new selection of sensors.