A new Web portal, Jewish Life in Poland, is making directly accessible thousands of maps, photos, films and other everyday artifacts of what was once the largest community of Eastern European Jews before World War II. Little remains of that world, but the site’s creator, YIVO Institute for Jewish Research, once located in Poland but now in New York, has created a portal that presents a variety of documents, videos (from film), audio clips in Yiddish , Polish, Hebrew and Russian — all described in English.