[jzwinck]

If you have a good internal service for auth/z, you can store passwords for less-critical outside services in plain text files on a network filesystem, with permissions locked down so that only the relevant people can read those files. In terms of security this seems similar in strength to what Passpack does--it lets authorized users see the actual passwords if they want to, or you can build applications on top to read from the file and log in to outside services. I did something like this once for FTP-style logins, and it worked all right.

Apart from that case, you really can integrate Kerberos or similar into your own applications, using e.g. SASL.