This site's got a glossary of Yiddish words and expressions.
'Haynt'; the digitalisation of a Yiddish newspaper that was published from 1908 to 1939.
A poem in Yiddish (I can only view the transliteration; the original appears as gibberish by me).
Wi asoj di Chelmer hobn farukt dem Barg
Lyrics of Yiddish songs and their German translations (Click "Weitere Texte" on the bottom right-hand side to view more texts.)
An online Yiddish course including audio-documents of real native speakers to read along to (The navigation's in German.)
Synoptical view over the alphabet (print, handwritten, numeric value, sound)
Yiddish Dictionary Online (uses klal sprakh)
Yiddish / German / French / Hebrew / English / Russian (If necessary, activate active X-element and click on the speaker symbol to hear the word pronounced in Yiddish.)