This site by Jun Da contains a lot of very interesting resources for anyone who wants dig deeper into frequency lists. One set of data I haven't found anywhere else is a frequency list of syllables... Read more.

lingua.mtsu.edu

This article describes the basics of way to teach tones that is different from the traditional way mainly in that the third tone is no longer described as a falling-rising tone (since that is rarel... Read more.

sinosplice.com

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

This website contains a lot of short and easy-to-access articles about science and technology related articles (although they are usually very lightweight, you don't need to actually be a professio... Read more.

jandan.net

This is the official Chinese version of the popular news website TechCrunch, focusing on information technology and related companies, start-ups and much more. Read more.

techcrunch.cn

This is probably one of the best resources for upper-intermediate or advanced learners of Chinese who want to learn something using their Chinese. Khan Academy has hundreds of videos about differen... Read more.

youtube.com

This site collects almost a thousand textbooks used in Chinese schools, ranging from grade 1 up to senior high school. Subjects cover Chinese, mathematics, English, physics, chemistry, biology, his... Read more.

dzkbw.com

This site offers a wide range of short articles on science and technology related articles. They also offer MOOCs, but I haven't actually tried them yet. This is from their official about page: ... Read more.

guokr.com

Duanmu San's "The Phonology of Standard Chinese" is by far the best introduction to Mandarin phonology that I'm aware of. It's mostly useful for people who like phonology or are already at an advan... Read more.

hackingchinese.com

Engadget is a multilingual technology blog network with daily coverage of gadgets and consumer electronics. This is the Chinese version, so anyone who is interested in tech will find lots of readin... Read more.

chinese.engadget.com

This is a site where you can find theses and dissertations published in Taiwan. It's an excellent source if you want to find research about specific topics and improve your reading ability at the s... Read more.

ndltd.ncl.edu.tw

This is a unique resource that shows how most common speech sounds are actually produced. Most other resources use animations and diagrams, but this is the frist I see which show actual MRI scans. ... Read more.

seeingspeech.ac.uk

This site is provided by 科普中国, and as the name implies, it answers why questions about everything from aliens to economics. The articles are of varying length and while there aren’t literally 10,00... Read more.

10why.net

This is a presentation by Thomas S. Mullaney about Chinese typewriters through history. In the digital age, typing in Chinese is easier than it has ever been, but how did the Chinese typewrite evol... Read more.

youtu.be