This is the best overview of spaced repetition research I have seen online or offline. It's thorough, well-argued and probably covers more than you were looking for. It's not specifically about Chi... Read more.

gwern.net

There are currently around 80 videos here that introduces vocabulary and phrases in Chinese. They are mostly idiomatic expressions or other words that typically don't appear in textbooks, so that's... Read more.

youtube.com

This tool gives you the most common bigrams found in news language or general fiction (choose which one). Note that a bigram isn't necessarily a word. For instance, 一个 isn't a word, but it's a very... Read more.

lingua.mtsu.edu

This is a newsletter for advanced students run by Andrew Methven. The free version includes a weekly newsletter with highlighted readings and some interesting vocabulary highlighted and discussed. ... Read more.

newsletter.slowchinese.net

This is a review of Perry Link's book about Chinese. This passage sums it up pretty well, and although I haven't read the book (yet), it's high on my list of books to get my hands on: "In writin... Read more.

lareviewofbooks.org