Plain Language Commission
UK -based business offering writing skills courses for business and governmental organizations, plus accreditation programs for documents written in clear English.
http://www.clearest.co.uk/

Plain Language Service
Canadian service which conducts workshops on clear verbal communication and plain language, offers plain language revisions as well as translations of text from English to French.
http://www.pls.cpha.ca/

The Right Conversation
Content consulting services for web site owners and other online publishers. Flat-rate web content critiques available. Also offers freelance writing and editing.
http://www.rightconversation.com/