We have a server on a domain using AD today, but we want to add
another authentication method, LDAP, that is in use on another domain
as a second provider, in order to give both domains access to the
same site collection. We are using MOSS. I have tried the adding a
membership provider for LDAP to the web.config like so:

<connectionStrings>
<add name="NewMemberShip1"
connectionString="LDAP://DOMAIN1.ORG"/>
</connectionStrings>
<membership defaultProvider="AspNetActiveDirectoryMembershipProvider">
<providers>
<add connectionStringName="NewMemberShip1"
connectionProtection="Secure" attributeMapUsername="Acountname"
maxInvalidPasswordAttempts="3" passwordAttemptWindow="5"
passwordAnswerAttemptLockoutDuration="3" enableSearchMethods="true"
name="AspNetActiveDirectoryMembershipProvider" />
</providers>
</membership>

Does it look like I am missing anything?

Do I need to have the LDAP DLL installed in the GAC of the MOSS
server?