Where is an Emacs that can handle Semitic (right-to-left) alphabets?
Emacs 20 and later supports Hebrew characters (ISO 8859-8), but does not yet support right-to-left character entry and display. Joel M. Hoffman has written a Lisp package called hebrew.el that allows right-to-left editing of Hebrew. It reportedly works out of the box with Emacs 19, but requires patches for Emacs 18. Write to Joel if you want the patches or package.