What are some mailing lists for natural language?

Free web-based services offering an easy way to run and maintain such lists were popular in the late 1990s, but many of these were taken over or went bust, so that the only popular provider is now Yahoo! Groups. This is used by a wide range of groups, including organisations who might at first glance be considered 'rivals' to Yahoo!. MSN Groups appears to be pushing hard to catch up to Yahoo!. Freelists.org is a web-based service using all-free software, though it may be more difficult for some users to set up. The new version of Google Groups includes free mailing list services as well as access to Usenet. MailSpaces adds wiki and feed aggregation to the traditional group model, and ties it together with an "auto-tagging" function using natural language processing techniques.