It's been a very long time since polyglot from Free Language has actually published a list of the latest updates to the site. At last, this happened last night. So here goes with a healthy chunk of Mandarin Chinese language-learning goodness...

Foreign Language Translation Extensions/Tools/Plugins/Add-Ons for the Firefox Web Browser
SurvivalPhrases.com Survival Phrases in Chinese, Korean, Japanese, French, Swedish, Arabic, Spanish and Vietnamese
FSI-Language-Courses.com US Foreign Service Institute Mandarin Chinese Free Audio Lessons Downloads
ExpertVillage.com Instructional Videos on Learning Foreign Languages
The Alternative Dictionary: Slang, Profanities, Insults and Vulgarisms from all the World
Learn Chinese on YouTube with Mandarin Videos from ActiveChinese
Learn Mandarin Chinese Videos on YouTube AskBenny Channel
A Pinyin.info Article on Most Difficult and Challenging Aspects of Learning Mandarin Chinese
Dickinson College's Language-Exchanges.org Mixxer Free Skype Language Exchange Community
Quick Translation Firefox Extension to Translate Single Words in 17+ Languages
United Nations Declares 2008 the International Year of Languages
nciku.com nciku Free Online Mandarin Chinese Handwriting Recognition, Conversations, Radical Dictionary
open.ac.uk OpenLearn LearningSpace Open University with Free Courses in Modern Languages
italki.com Free Skype VoIP and IM Language Partner Community
Download Free Open University Courses from MIT OpenCourseWare Foreign Languages and Literatures Department
About.com Distance Learning Free Online Language Courses
MyHappyPlanet.com My Happy Planet Private Social Language-Learning Community
List of Free Foreign Language Courses Online at Education-Portal.com
English Language Learning and Teaching Article on Wikipedia
A Torrent File for 500 Free Mandarin Chinese Audio Podcast Lessons from ChinesePod.com
BYKI.com Download Free Language Software for Learning 42 Languages!
MangoLanguages.com Mango Languages Free Online Language Courses, Audio, Web Software
Word2Word.com Website
LiveMocha.com Live Mocha Social Language Learning Course and Networking Website
Lingopass.com Free Global Language Exchange Community

For a complete list of updates including languages other than Mandarin Chinese, zoom over here.