It's probably been online since 2002 (that's the most obvious interpretation of the page), but until today I had not realised that von Gall's edition of the Samaritan Pentateuch was available online. To see it click here. Now admittedly there are some weaknesses with this edition, most notably its tendency to give preference to Masoretic spellings. Nevertheless, it is still the best edition of the whole.
On the same site you will also find von Soden's Die Schriften des Neuen Testaments, the Cambridge edition of the Septuagint, Field's Hexapla, and many more goodies including images or editions of a number of important manuscripts.