NB: All the links that were below appear to be dead so I have removed them. Please go here, to the Midrash Project, and follow the links from that site.
An announcement worth sharing.
Midrash Shir HaShirim Rabbah: A Synoptic Edition
by Dr. Tamar Kadari, Schechter Institute of Jewish Studies
Supported by the Israel Science Foundation
We are pleased to announce that Midrash Shir HaShirim Rabbah: A Synoptic Edition
is now available online as part of the Midrash Project on the Schechter Institute of Jewish Studies website.
The synoptic edition includes all the textual witnesses to Midrash Shir HaShirim Rabbah: manuscripts, editio princeps, Yalkut Shimoni and all Genizah fragments.
Other synoptic editions in the Midrash Project available online include:
Midrash Esther Rabbah: A Synoptic Edition,
Professor Joseph Tabori and Dr. Arnon Atzmon
Midrash Shmuel: A Synoptic Edition,
Prof. Berachyahu Lifshitz
Midrash Kohelet Rabbah: A Synoptic Edition,
Prof. Menachem Hirshman and Dr. Reuven Kiperwasser