ERC is an IRC client for Emacs/XEmacs. It supports multiple channel presence, elaborate faces' setup, pals' list, and some other nice features. It's capabilities should be sufficient for most of IRChatters.
Information regarding Project Releases and Project Resources. Note that the information here is a quote from Freecode.com page, and the downloads themselves may not be hosted on OSDN.
This release has an erc-ezbounce module, an improved menu, more nickserv support (GalaxyNet and iip). Some long-standing bugs related to XEmacs have been fixed, and there are a lot of other minor bugfixes and improvements.