Hartman Harness
"Hartman's Hip Helper: A Dog Harness for canine mobility which allows your support, and assistance to dogs who are disabled or crippled due to hip dysplasia, degenerative myelopathy, arthritis, spinal injuries, surgery, or other conditions."

Handicappedpets.com
A great resource for disabled pets; free classifieds, great discussion forums, products, helpful articles, etc.

Craigslist
Great resource for community info, jobs, for sale, activities, roommates, discussions forums, etc.
Don't forget to click on your specific city!

If you'd like to do a link exchange, please email me your URL. It does not necessarily have to be related to pets.