All Free Dictionaries Project
Online project to build free translating dictionaries (e.g. English to Spanish) by allowing individuals to add and correct entries. Several dozen languages represented so far. Dictionaries can be searched online or downloaded. Includes links to other free dictionary sites.
A variety of Chinese-language-related resources, including a set of 20 introductory Chinese lessons, Chinese/English and Chinese/French online dictionaries, Simplified/Traditional Chinese character converters, and more.
MDBG Chinese-English Dictionary
Searchable English to/from Chinese (Traditional or Simplified) dictionary with audio for most entries, and Windows/Apple downloadable dictionaries.
nciku English Chinese Dictionary
Free searchable English to/from Chinese dictionary (includes the ability to draw Chinese characters) with pictures and audio, a picture dictionary of basic Chinese vocabulary, and the ability to save vocabulary lists for your own practicing.