Mama Lisa's World provides a vast collection of children's nursery rhymes and songs from around the world, along with translations and MP3s to listen to.
The Little Mother Goose, 1912. Exhaustive compendium of classic Mother ہنس rhymes. Chaotic to navigate through, but worth a look. An eBook from Project Gutenberg. (Scroll down and click HTML "Main Site")
Cecily Parsley's Nursery Rhymes, 1922. Beatrix Potter's beautiful illustrations accompany traditional nursery rhymes. An eBook from Project Gutenberg. (Scroll down to "HTML - none - 30KB" and click "main site" to view the eBook)