We are using Salsa for Spanish and my kids are loving it. http://www.gpb.org/salsa My kids are 6, 4, 3, and 2 and all of them sit in rapt attention to the little videos. Then we try to use the vocabulary words as much as possible during the day. We do about 2 videos per week. My husband speaks Spanish, so at supper time the kids have fun telling Daddy all the new words they know.
I’m not sure where we’ll go after this, but we are having fun so far. I’ll have to check out the link you gave to see where those books might fit in.
Joanne