After the last Harry Potter book, was S.P.E.W. (the Society for the Promotion of Elfish Welfare) successful?
I know that Hermione said that she wanted to "take S.P.E.W. further" when talking about careers in OotP.
Further to Richard's answer, it should be noted that:
Katieleigh: Does hermione still continue to do work with spew and is life any better for house elves!
J.K. Rowling: Hermione began her post-Hogwarts career at the Department for the Regulation and Control of Magical Creatures where she was instrumental in greatly improving life for house-elves and their ilk. She then moved (despite her jibe to Scrimgeour) to the Dept. of Magical Law Enforcement
Her position within the Department for Regulation and Control of Magical Creatures provided an excellent platform for Hermione - founder and foremost proponent of SPEW - to further the cause of House Elves.
Yes (to some extent).
As part of an interview for her US book tour in October 2007, J.K. Rowling offered audiences some exclusive "Harry Potter secrets" during Q & A sessions. These 'facts' have been confirmed by several sources and are assumed to be correct.
Hermione greatly improved the life for house-elves after her graduation