The code is at https://bitbucket.org/thesheep/micropython-oled/overview
See the README for explanation and examples.
This time I wrote drivers for something that mostly already had its drivers in MicroPython — the monochrome OLED displays. I did that, because I wasn't happy with the existing drivers — they are a bit elaborate in terms of indirection and inheritance. Sure, code reuse and so on, but not very nice for constrained platforms. So I did my own, trying to optimize them. I also exposed some useful functions, like flipping and hardware scrolling.
I will hopefully add some more exotic displays there, as I get specimen to test on.