First, they have changed the name of the JewishGen ShtetlSeeker, their large database of place names (as opposed to the smaller more focused JewishGen Communities Database), to the JewishGen Gazetteer.
The new JewishGen Gazetteer also covers more places, including the Scandinavian countries (Denmark, Sweden, Norway and Finland), Spain, Portugal, Luxembourg, Kyrgyzstan and Yemen.
Lastly the Gazetteer also gains some new functionality, including search using the more advanced Beider-Morse Phonetic Matching (in addition to exact, starts with, contains and Daitch-Mokotoff Soundex searches). names shown in non-Latin characters, and names are now listed in the order of relevance.
Second, JewishGen has changed the name of ShtetLinks to KehilaLinks.
If you're not familiar with one or both of these features of JewishGen, I recommend checking them out thoroughly. They are both immensely useful for genealogy, particularly Jewish genealogy. I wrote about both of these features previously (under their former names) in my article Jewish Genealogy Basics: Ancestral Town (Shtetl) Information. Give it a read to find out more about these JewishGen features and how to use them.