The Digital Archive Project, or DAP is a community of people who are attempting to preserve TV shows that are no longer regularly broadcast and that are not completely available on VHS or DVD. We also do not currently archive shows that already have a dedicated group of people archiving episodes, e.g. Family Guy.
While the DAP started as a way to preserve episodes of Mystery Science Theater 3000, it has since grown tremendously. DAPs exist for many shows, including The Adventures of Pete and Pete, NewsRadio, Freakazoid!, and Samurai Jack (not to mention MST3K.)
For more information, visit http://www.dapcentral.org/