For a recently taken course in Machine Learning, a substantial part involved learning and applying linear classifiers and clustering algorithms on smaller data sets. In order to summarise the most important material, I created a cheat sheet in LaTeX. I figured someone else might appreciate it as well, so why not make it available for more people than myself?
Note that his document was really only created for my own study purposes, and hence might be of limited use for others. Hopefully not, though.
EDIT: Discussion on Hacker News: http://news.ycombinator.com/item?id=2515612