Cheat Sheet of Machine Learning and Python (and Math) Cheat Sheets
Robbie Allen

Good stuff, but please use something other than Dropbox.

Dropbox has serious security issues that can allow invasion of a user system with viruses and malware at the file system level. It also requires installing yet another app which try to avoid like the plague. In fact the proliferation of apps is a kind of plague.

Can you put your content on some kind of file sharing service which operates without need of a specialized client, but uses just a browser?