5 Learn German

Deutsche Welle has good German Language materials

DW German audio lessons - great audio lessons, that are short and clear
DW interactive german courses
The free online language course "Deutsch Interaktiv" is aimed at German learners from level A1 to level B1 within the Common European Framework of Reference for Languages. Audio and video clips help to train listening and visual comprehension.
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DW Audio trainer
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Also: YouTube, really great resources for language learning there
Germany alphabet song here

Learn any language: some tips