The following sites have all been recommended by our students:
Vera http://www.lingq.com/profile/VeraI/ has compiled this very useful document: http://docs.google.com/View?id=dgpj8nz7_5dw7pkvgj
Marianne has compiled this for French learners:
http://docs.google.com/Doc?docid=0AVntdiXS6biJZGM5dGZjejhfMWNqNno5aGhw&hl=en&pli=1
www.librivox.org audio books with text for download, mostly English, a lot of French, some German and other languages.
http://www.litteratureaudio.com/ audio books with text in French
The people at MobileRead have created a library of free ebooks in various formats: http://www.mobileread.com/forums/ebooks.php?order=desc&sort=dateline
http://www.livrespourtous.com/: lots of ebooks in French
http://manybooks.net/ ebooks in various languages, unfortunately no Russian.
Japanese: Namiko's Japanese Language Blog
Yutaka http://www.lingq.com/profile/YutakaM/ recommends the English as a Second Language Podcast: http://www.eslpod.com/website/index_new.html
The LingQ spreadsheet of sources of audio with transcripts in all LingQ languages and then some is here: http://spreadsheets.google.com/ccc?key=puKZ2MgecpTV7hPkp1Lm7Pw&hl=en
The following should probably be moved to the LingQ spreadsheet but it hasn't happened yet:
Interesting Thing of the day (English only) at http://itotd.com/
First Monday podcasts (English only) at http://www.firstmondaypodcast.org/
NASA podcasts (full list see here):
YLearner recommends this Dutch dictionary: http://www.mijnwoordenboek.nl/
Flashcard systems
David (http://www.lingq.com/profile/DavidMartin/) recommends Anki for learning Chinese vocabulary: http://ichi2.net/anki/screencast1.html and smart.fm as a source of vocabulary: http://ichi2.net/anki/wiki/Plugins#Importsmart.fmi%20tems.2Candgenerallists