Ideas for a computer literacy class for middle school students?

[Techhexium]

Hi, I am going to volunteer in a community center (YMCA) by teaching a computer literacy class for middle school students or young children.

However, I'm suppose to design a curriculum or rather plan out the lessons. The class will take place once a week in July and maybe August so 4-5 classes.

The Wikipedia article on computer literacy has a good general definition on the topic, but my question is, what would be acceptable to teach to young students, and what kind of activities would make it a fun experience? (EDIT: activities like educational video games or making simple Java programs that are buggy to teach students what computer bugs are)

Thanks!