World of Islam UK has a catalogue of useful songs and videos (cartoons and documentaries) regarding Islam, especially geared towards younger kids. http://www.islamworlduk.com/intro.html Some of the audio and visual material is produced by Yusuf Islam; most of the audio stuff includes songs aimed for kids aged 10 or under, Arabic alphabet exercises and biographical chapters regarding different Prophets.
If anyone knows of any other online resources where one can order Islamic stuff, please post here