Reading
煎蛋 – Jandan.net (short sci & tech articles)
豆瓣读书 – Douban (book reviews, store)
好读 – Haodoo (ebooks, 繁体字）
Dictionary/Flashcards
Yellowbridge (dictionary, etymology, flashcards)
The Classical Chinese Dictionary (文言文字典）
Lexicool (Chinese > English translation dictionary)
Videos/Movies/Television
Cbox (live television, movies)
LeTV*
PPTV*
Baidu video top charts
Weibo video top charts
*-limited content outside of mainland China
Podcasts
Radio
Interactive
Italki (language exchange, chat, online tutoring)
Lang-8 (language exchange, writing practice/editing)
HiNative (language-learning Q&A platform)
The Washington Chinese Language Meetup Group
Marco Polo Project Translation Club
Mobile Apps
Hanping (Dictionary)
Pleco (Dictionary)
海词词典 (Dictionary)
Anki (flashcards)
网易-NetEase (News)
新浪新闻- Sina (News)
Skritter (character practice)
Hanzicraft (character practice)
Ninchanese.com (language learning software, multiplayer Chinese vocabulary games)
Chinese Writer (stroke order practice)
Google IME (Chinese writing input for Android)
Hanzireader (reading annotator-iOS only)
Miscellaneous
Blogs/Newsletters
Sinocism (News/Policy in English and Chinese)
Hacking Chinese (Language learning, acquisition, maintenance)