I've added some free PDFs on the sidebar and will probably add some more over time. These are my write-ups of some of my favorite techniques, ones that I don't see in common use.

Lifted increases look similar to regular decreases. Both left and right lifted increases are possible, mirroring left-leaning and right-leaning decreases.

The disappearing loop cast-on is useful for starting any knitting you work from the center outward, like doilies, some shawls, and hats or mittens knit from the top down.

Links go to Google Docs; the PDFs look better in a different viewer.