I'm about to do an multi-week after school "Intro to Programming" session at our local elementary/middle school in Scratch in Baltimore city. 8-10 weeks for 5th to 7th graders. It is an urban school with quite a range in the kids' abilities and not all kids have working computers at home. It'll be a challenge but I think the kids will surprise me.

Last school year I taught 2nd graders a little bit using Scratch and many of them got it and with a bit more exposure this year they could be creating programs on their own.