Because he was was pronounced a heretic by the Catholic Church, this work lay in obscurity until the 19th century. It is hard to find in English translation, but available in print (translated by Priscilla Throop), apparently directly from the self-published translator -- she lives in Charlotte, VT, so this must be her own imprint:
http://www.lulu.com/shop/priscilla-throop/yes-and-no-peter-abelards-sic-et-non/paperback/product-14856111.html

This would be awesome to have in Logos, to accompany The Love Letters of Abelard and Heloise.
Summary from the book description:
Peter Abelard's SIC ET NON lay in obscurity until the 19th century, when Victor Cousin discovered a full manuscript and a fragment. Since then, another full MS and eight fragments have come to light. Abelard's SIC ET NON presents 158 theological questions, followed by citations from various Church fathers, councils, and creeds. These conflict in their discussion of the matter at hand, some SIC (YES) others NON (NO). Abelard includes the "Gelasian Decretals", showing that all of his citations are from approved works. Abelard was condemned as a heretic and sentenced to perpetual silence (1141), and his writings were included on the list of prohibited works (1563). SIC ET NON is a gem of theological education.
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Peter Abelard (1079 – 1142) was a medieval French scholastic philosopher, theologian and preeminent logician. He also was a music composer. The story of his affair with and love for Heloise has become legendary. The Chambers Biographical Dictionary describes him as "the keenest thinker and boldest theologian of the 12th Century." [from Wikipedia]
Abelard's works in general have not received enough attention; this from the Online Reference Book for Medieval Studies: "For whatever reason, we have no Benedictine edition of the works of Abelard, and indeed no critical edition of his complete works at all. His works have been edited piecemeal by various scholars, and some have not been properly edited at all. David Luscombe has written: '. . . future generations of philosophers were not much aware of Abelard's writings or ideas. The reasons for this still await elucidation.' One reason is surely that Abelard lacked any support group to push his cause. The Benedictines did not rally round. I have found that when I mention this to Benedictines, they generally respond 'I didn't know Abelard WAS a Benedictine.'"