digchinese.com
Resources for Learning Chinese
ichinesereader.com
Monthly subscription Android and iOS tablet app containing books in Chinese primarily aimed at schools.
LingQ
Paid website with user-contributed dialogues annotated with pinyin and with audio recordings and a flashcard feature. Free trial available.
iChineseLearning
iChineseLearning is a premier online Chinese learning institution, where you can learn authentic Chinese with 1-on-1 teachers live from China. Lessons are delivered in real time over skype.
Learn Chinese Grammar
This is a Chinese grammar learning site. It uses a progressive approach to help you learn basic Chinese grammar through sentence structures and practical examples.
Chinese Course
Learning Resource which offers many features, such as audio flashcards (for both words and sentences), daily free newsletter, annotated dialogues, comprehensive dictionary, text analyzer, topic lists. Suitable for beginner, intermediate or advanced learner.