I agree with Allen about writing your own code. Every peice of code you see should be analyzed for things to add into your "bag of tricks."

However, I2C is relatively easy if you don't need a particularly efficient implementation. Not for novices maybe.

I use I2C in training our assembly language programmers. After shift register assignments, I push them directly into I2C. From there its on to iButton protocol and by then I have confidence they can handle most any type of I/O programming.

-Jay C. Box