The most comprehensive page on Emma was prepared by Kali of the Republic of Pemberley, and is housed on their computers. This is updated regularly and contains opinions on the novel, character descriptions, information on such things as the movie adaptations, published sequels, and Emma fan fiction.
Letters Relating to the Dedication of Emma
Jane Austen E-texts, Etc. has the letters which were exchanged between the Librarian to HRH The Prince Regent and Miss Austen regarding the dedication of Emma to the Prince.
Opinions of Emma &
Letters about Emma
Jane Austen E-texts, Etc. also has a collection of the opinions of Miss Austen's acquaintance upon reading Emma and a number of other letters written by Miss Austen, her brother and others which pertain to this novel.
This page has excerpts from some essays on Emma and Jane Austen.
If you have more links to add, e-mail to: suggestions@austen.com