Are There Any Good Language Learning Programs for Children?

I know that there are all sorts of programs available for adults to learn various languages, but what about children? Are there any good programs for them? I don’t want it to seem like a chore, but I would like to see my children learning German from an early age so that it is easier for them to pick up the language. I had a hard time learning when I was an adult, and I have heard it is better to learn this sort of thing as a child. Can anyone recommend a good program? It has to be something other than just audio tapes, preferably something a bit interactive.