Google Groups - Searchable archive of more than 700 million Usenet postings from a period of more than 20 years.

Yahoo Groups - Groups offers free mailing lists, photo & file sharing, group calendars and more. Discuss hot topics, share interests, join online communities.

Flickr Groups - Groups are a fabulous way to share content and conversation, either privately or with the world.

Windows Live - Bring your team, club, or any group of people together online.

MySpace Groups -