cross the OLPC XO-3 off the list -- One Laptop Per Child founder Nicholas Negroponte told PC World that the slate's debut has been pushed back roughly 45 days, until the middle of February instead. Whether the Marvell Moby-based tablet turns out to be a sexy, paper-thin device or a chunky contraption wasn't discussed, but Negroponte did have a simple explanation for the delay -- he needed a suitable surface to cover that probable Pixel Qi touchscreen. "The issue has been really finding an unbreakable material," he said, hinting that "it may be glass or some flavor of glass," rather than plastic as originally planned. Might we suggest a taste test at the Corning laboratories, Mr. Negroponte? We hear they have a Gorilla that does quite nicely. Video after the break.