See ErcExtraModules first if you use the version of ERC that comes with Emacs 22 and you don’t have erc-bbdb.el.

BigBrotherDataBase integration with ERC is not enabled by default. To enable it use M-x customize-variable RET erc-modules.



See also makes the bbdb popup (e.g. from gnus) print whether the user is online in an ERC server, and lets you open a PM with that user on pressing “i”.

ERC, ErcExtraModules