Sam from lincomatic has released his new I2C LCD Arduino library. Known as LiquidTWI2, its a lean, high speed I2C LCD Library representing an extension of the work done by FalconFour on his LiquidTWI library, with the addition of support for Arduino 1.0+ and for Adafruit RGB LED Shield (MCP23017-based).
Via the contact form.
Why not using the PCF8574? 8bit I2C expander. THe MCP is pricey and 16bits are a bit to much.
It has long been done to PCA9675PW and HD44780. Reference to the translation of the article: