Chinese Language:

Zhongwen
This site contains very useful resources for Chinese characters and culture. It contains a very comprehensive dictionary, readings, as well as a section for improving you Chinese vocabulary.
www.zhongwen.com

Yellow Bridge
This site has the web's most comprehensive Chinese-English Dictionary. It also has Chinese Flashcards that you can practice with, including a Chinese Memory Game.
www.yellowbridge.com

Mandarin Tools
This website contains very useful resources... from Flashcards, to dictionaries, to Chinese software to help you input pinyin characters.
www.mandarintools.com

Chinese Music & Entertainment:

Karazen
Karazen is a website that contains interesting movie and album reviews, the latest Chinese music, as well as news in the Chinese entertainment industry.
www.karazen.com

Learn Chinese Through Music
This site is created by Janice Chiang. She translates Chinese pop music into English... Commonly, she translates music by Jolin Tsai, Jay Chou and Wang Lee Hom (as well as other singers and musical groups). It's a great way to learn Mandarin... I really love what she's done for people to appreciate Chinese music better!
www.learn-chinese-through-music.com

News:

China Daily
China Daily is updated on, er, a daily basis! Its articles are written in English... Besides news from China, it also features main headliners from around the world! This site also links to HK Edition, the Shanghai Star, 21st Century, China Business Weekly, Beijing Weekend, as well as The Olympian.
www.chinadaily.com.cn

Taipei Times
News from Taiwan ~ It's articles are also written in English. I normally visit this site when I want to read more detailed news on what's happening in Taipei and the other cities in Taiwan.
www.taipeitimes.com