It depends. Things seem to be changing on what might be useful to teach to kids these day's.
I haven't heard of much curriculum out there, so it looks like it might have to be a community effort to create some. Take a look here:
http://ubuntukids.org/blog/?page_id=6 https://launchpad.net/~jphutch
It hasn't really got off the ground yet, but he set this page up for getting some curriculum going:
http://ubuntukids.org/blog/?page_id=6
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To be honest i don't think there should be curriculum teaching office. Maybe excel/powepoint stuff, but that's about it. Take my advice, kids hate "learning" office.
curriculum for K-5th: simple computer programs. -Tuxpaint -some math programs (or math games) -spelling game? -typing program?
curriculum for 7-8 maybe a little bit o excel/ppt skills. maybe intro to programming? (greenfoot project)
curriculum for high school preparing research paper knowledge programming classes (greenfoot, python, maybe even others) graphics classes (inkscape, GIMP, kolourpaint) Physics programs Chemistry programs -other useful stuff.