osx-keychain.el allows you to access OS X Keychain entries using Emacs. This allows one to store passwords used by Emacs packages such as erc and emacs-jabber safely in OS X Keychain.
TODO
Here is how you might use osx-keychain.el to configure emacs-jabber:
(setq jabber-account-list
`(("[email protected]"
(:network-server . "jabber.example.com")
(:connection-type . ssl)
(:password . ,(find-keychain-internet-password "[email protected]" "jabber.example.com")))))