What a great idea. If you want to focus your business efforts on working with like-minded folks, check out the Vegan Chamber of Commerce. According to their site, "Supporting vegans reduces our impact on the environment, prevents global warming, and reduces the suffering of animals..." and, "Our Business Directory lists vegan businesses, professionals, service providers, and vegan supporting organizations anywhere in the world."
The directory needs to be beefed up (so to speak) -- so if you're vegan and you provide services, please sign up today! It's free to post your business, and $100/year to become a sponsor. I'd love to see this site grow to the level it deserves to be.