http://liberatededucation.blogspot.com/2010/03/spellquizzer-giveaway.html
The software is not a curriculum, but a tool that allows you (or an older student) to record a spelling quiz (with audio if you want) for self-study.
It's a small blog, and so far only a few people have signed up and half of them are my friends.
I feel a little guilty just drawing from a pool of friends. I feel it would be more fair if there were anonymous competition so sign up if you think you might like it!
The reason I have a copy to giveaway is because I was given a copy and asked to review it, and it's actually fairly useful.