I am currently working on a SharePoint 2010 project where the environment is setup with a SharePoint web application using claims based authentication. The web app is created on port 8081 using Windows Authentication for auth, and extended to port 80 using Forms Based Authentication.
The forms authentication provider is setup to use the same active directory as the windows auth based site, using the following entries in the application's web.config (the entries are in the central administration and security token service web.config files as well):
<add name="i" type="Microsoft.SharePoint.Administration.Claims.SPClaimsAuthMembershipProvider, Microsoft.SharePoint, Version=22.214.171.124, Culture=neutral, PublicKeyToken=71e9bce111e9429c" />
<add name="FBA_AD_MP" type="System.Web.Security.ActiveDirectoryMembershipProvider, System.Web, Version=126.96.36.199, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a" connectionStringName="ADFBAConnectionString" enableSearchMethods="true" attributeMapUsername="userPrincipalName" />
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