SparkFun COM-00525 I2C EEPROM – 256kbit
2 Wire Serial Communication (I2C) EEPROM – The back bone of any microprocessor project. These 8 pin chips need only two wires to communicate and retain their data even with power failure. Use the 256K EEPROM for some serious data storage!
Check out the Portuguese Arduino Tutorial and accompanying Windows App, by Daniel Gonalves.