In December, our school participated in The Hour of Code, an opportunity for every student try computer programming. This was an amazing experience with even our youngest students giving it a try.
Since then, my students have continued to learn by going through the K-8 Intro to Computer Science course at http://learn.code.org/.
This is a great opportunity for every student. The tutorials are all there to walk the students through all of the steps.
One of my students completed the course in a couple weeks, another is close to completion and the rest are working on it at their own pace. The two who are farthest along are mentoring a 1st grader who is interested in learning also.