Internet Bumper Stickers preserves a late-1990s idea of social sharing: small downloadable slogan graphics meant to be pasted into websites, blogs, e-mail, and whatever other corner of the web would accept an image.
Virginia Shea's 1994 Netiquette became both a book and an online reference for email, discussion groups, privacy, flame wars, electronic style, and the basic problem of remembering that people on the network are still people.
InterGuru has been converting address books between long-obsolete mail programs since 1996, preserving a wonderfully specific utility from the era when moving contacts between programs was its own technical problem.
DanHatesSpam.com documents Daniel Balsam's long-running effort to track unsolicited commercial email, sue senders under anti-spam law, and publish the results as a public-service website.