We have the Muzzy videos and French Made Easy vol. 1 (the Moustache video). My son (age 3) used to love Moustache, but it has been supplanted by Muzzy, which he adores. I find it's a little difficult to make out some of the words and sometimes it seems that the audio is lagging a little, but I like it well enough. We also have a couple of CD's, which he asks for often; they both come with books, which he likes to "read," but I haven't gotten seriously into reading along in the book with the CD (since we're usually in the car when we listen).
I'm not expecting my son to become bi- or multilingual because of them, but I want him at least to get a feel for one or two other languages before he begins formal language lessons later on. He's picked up a few basic words, can count to 10 in French & Spanish, remembers his favorite songs from the CD's. Plus, it's helping restore the French & Spanish I learned ever so long ago!