I didn't think Yiddish was dead, nor Esperanto (not widely used but it is the most widely used "artificial" language). I like Latin and Ancient Greek. I despised languages in school but for some reason I like Greek and Latin. I am always threatening to learn Ancient Egyptian Hieroglyphic language but never have the time... Being Welsh everyone asks if I know that which I don't as no-one in my family ever spoke it. Welsh was a dead language that has been resurrected for political goals which I fail to see the point of. :)

1) I learned Latin and Old Greek, which are considered dead languages (although they were used widely for the Catholic mass until the end of the 20th century. None of the languages you mentioned is a dead language. I think Yiddish is not so difficult to learn if you know German. I could eventually learn it. 2) "Yiddish is written and spoken as a living language in many Orthodox Jewish communities around the world. It is most notably used as a first language in most Hasidic communities, where it is the first language learned in childhood and used in home, schooling and many social settings." "Total speakers: 3 million" Source and further information: http://en.wikipedia.org/wiki/Yiddish 3) "Esperanto is the most widely spoken constructed international auxiliary language" "Total speakers: Native: 200 to 2000 (1996, est.); Fluent speakers: est. 100,000 to 2 million " Source and further information: http://en.wikipedia.org/wiki/Esperanto 4) "Ladino is a Romance language with a vocabulary derived mainly from Old Castilian, Hebrew, Turkish and some French and Greek. Speakers are currently almost exclusively Sephardi Jews, for example, in (or from) Thessaloniki, Istanbul and Izmir." "Total speakers: 100,000 in Israel 8,000 in Turkey 1,000 in Greece 300 in the United States 150 in the Bosnia and Herzegovina unknown numbers elsewhere, steady decline in all those places " Source and further information: http://en.wikipedia.org/wiki/Ladino_language

Well none of those that you mentioned are dead languages, but I would love to learn Latin.