Archive-It.org - A subscription service from the Internet Archive, which allows institutions to build, manage and search their own web archive. Includes the sites of universities, libraries, and special interest collections of websites.
DevArchives - Contains archives of FAQs, mailing lists, and newsgroups all related to developer/programming/IT. Free.
The European Archive - Digital library of cultural artifacts in digital form. The collection includes public information films, recordings and Web harvest of political related and government websites.
Ghost Sites - Long running online "museum" provides screenshots of defunct sites.
Google Groups - Searchable archive of more than 700 million Usenet postings from a period of more than 20 years.
The Internet Archive - Nonprofit organisation established to preserve Web sites by taking regular "snapshots". The Wayback Machine provides links to older versions of a webpage. There are special collections, for example on Web pioneers.
NewsletterArchive.org - Aims to archive and make available to the public all email newsletters and electronic mailing lists. It will rely on user contributions for its content.
Pandora Archive - Australia's Web archive, established initially by the National Library of Australia, and now built in collaboration with nine other Australian libraries and cultural collecting organisations.
First Monday: Internet Time and the Reliability of Search Engines - Journal article by Paul Wouters, Iina Hellsten, and Loet Leydesdorff. Examines the consequences and implications of internet search engines continuously reconstructing the past by updating their indices. (October 4, 2004)
The Register: The Web as Historical Record - Essay by Peter Abrahams pointing out "one of the weaknesses of most search engines and the Web itself: you cannot sort by date." (May 4, 2004)
The Register: Google, the Only Archive We'll Ever Need? - Opinion piece by Andrew Orlowski. Points out that Google can't always index, retrieve and/or sort everything in useful ways, but its supporters are overlooking these major drawbacks to using it as an archive. (September 15, 2003)