Online language learning resources

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computer-assisted language learning (CALL)

Autonomous Technology-Assisted Language Learning (http://en.wikibooks.org/wiki/ATALL)
From wikibook.

A Place to Start in Selecting Software by Deborah Healey and Norman Johnson.
A comprehensive list of CALL software (English only)

CALL Software Database maintained by Fred Riley

Learn Chinese

Wikibook

Learn English

English is probably the most widely spoken language worldwide. There's a vast amount of learning resources on the web.
NPR.ORG: a non-profit American media organizations, a good source of news and podcast

For children

starfall: a free on-line service to help children learn to read, featuring interactive books, games, and many other reading exercises. It's fun and useful. My toddler son loves it so much!

Online Dictionaries

http://www.dicts.info/
A huge collection of dictionaries as well as a list of dictionary applications, such as vocabulary trainers and dictionaries for mobile phones and PDAs.

http://wiktionary.org/
multilingual dictionaries

http://www.stardict.org
multilingual dictionaries

http://www.thefreedictionary.com
English only, with free audio pronunciations!

http://dictionary.reference.com/
For English, but also returns simple translations in other languages. Audio pronunciations available for premium members only.