Microsoft, in collaboration with HiSoftware, developed and support the Accessibility Kit for SharePoint® (AKS) along with a partner and customer community to get you started on the road to Web accessibility with an accessible platform and framework from which to launch your SharePoint 2007 portal or intranet site.
Lawrence Liu announced the availability of the recently released AKS for MOSS yesterday.
Find more information at the AKS community site at http://aks.hisoftware.com/index.html