The mission of Best Friends is to help bring about a time when there are no more homeless pets, and when every cat or dog who's ever born can be guaranteed a good home with a loving family. Webguide Franny Syufy maintains an extensive list of sites dealing with animal rescue, welfare, adoption, and health. Lisaviolet's Cathouse is an excellent resource for information about declawing. Amby's Cat Info is an excellent resource for information about declawing. You'll find medical, ethical, and behavioral issues, training and trimming information, and instructions on building your own scratching posts.
Soft Paws nail caps for cats are an effective, safe and humane alternative to declawing.
If you've been unable to train your cat to use a scratching post, consider Soft Paws. Situated on 34 acres of gardens and trees, the Noah's Ark Animal Foundation is a sanctuary for homeless animals. They provide the shelter, love and care animals so desperately need to become healthy and happy again. Technically, this site isn't about animal welfare, and I don't endorse cat breeding - but I am including it because Thora and Scott are very caring people who train animals to work in the entertainment industry. You'll find links to humane organizations and sites, pictures of cats she has fostered, and a whole lot more.