Read many versions of the Cinderella tale at:  

http://www.pitt.edu/~dash/type0510a.html
Aarne-Thompson folktale type 510A and related stories of persecuted heroines translated and/or edited by D. L. Ashliman

http://www.acs.ucalgary.ca/~dkbrown/cinderella.html
This list of variations on the Cinderella story was initially compiled by Kathy Martin from suggestions by readers of the CHILDLIT mailing list

http://www.surlalunefairytales.com/cinderella/
An Annotated Cinderella, also includes history and similar tales in other cultures; Part of the SurLaLune Fairy Tale Pages by Heidi Ann Heiner

http://www.salem.k12.va.us/south/cinderella/
Cinderella Around the World : A play for children, book list, projects and links to other sites.

www.bernardsboe.com/MountProspect/Library/Cinderella/NAm_Native%20American.htm
Native American Cinderella tales