He just posted a new version of the draft, and added this blurb to his home page: "Vinay Deolalikar. P is not equal to NP. 6th August, 2010 (66 pages 10pt, 102

He just posted a new version of the draft, and added this blurb to his home page: "Vinay Deolalikar. P is not equal to NP. 6th August, 2010 (66 pages 10pt, 102 pages 12pt). Manuscript sent on 6th August to several leading researchers in various areas. You can find the current version here. Please note that the final version of the paper is under preparation and will be submitted to journal review." So no, he doesn't seem to be backing out...