Thread:Extension talk:LDAP Authentication/To use LDAP or OpenID?/reply

If you are looking for tight integration with a bunch of heterogeneous applications, then LDAP may be what you want. If you just want people to be able to log into all of your wikis easily using external sources (like google, or yahoo), then OpenID is likely what you want.

Either way, maybe you can use something like OpenAM, which is a web SSO server. It has an LDAP backend, which can be used for tight integration, but also supports single sign on, cross domain cookies, and other useful things. Also, OpenAM supports OpenID.

Every situation is different though. I'd investigate your options and see what solution fits.