New product! The SX1509 is a 16 bit io ecpander using the I2C interface.
My boards are chainable and come preset to use 3.3v input for pins but can be changed by cutting a couple traces.
In store: https://www.tindie.com/products/AtomSoft/sx1509-16-bit-io-expander/
Test: http://www.youtube.com/watch?v=dEiExJgisKM