Internet Archive - Wayback machine - search dead web sites
Internet Archive - eBooks and Texts - search free/open access and public domain
Biodiversity Heritage Library (partially (?) on Internet Archive as well)
Open Access Directory (list of disciplinary repositories)
Registry of Research Data Repositories (Life Sciences> Biology)
Archive.is - produce a snapshot of a web page that remains in online archive or save as a picture
Wayback Machine - produce a snapshot which gets saved in Internet Archive (must allow crawlers)
GuidesOpen Access Directory
Digital Imaging (Cornell Library) - guide to producing, storing and managing digital image collections
Digital Preservation - (US) Library of Congress portal with recommendations, guides, tools, events etc.
Library of Congress digital preservation recommended formats
Library of Congress information about digital file formats and their preservation
Digital Library Federation old guide page (introduction, links, rationale) [archived] | Digital Library Federation site
Digital Library Federation wiki - recommendations for special formats
MoreArchive-It - Libraries' digital collections preserved with Internet Archive
The Keepers Registry - List of agencies involved in archiving data and publications; long-term archival especially of e-journals.
LOCKSS (Lots of Copies Keeps Stuff Safe) - Libraries and other institutions preserve digital content creating redundant copies of "digital bookshelfs", shared with other libraries that are also associated with the program (global network) or in private networks. Maintained by Stanford University.
CLOCKSS (Controlled Lots of Copies Keeps Stuff Safe) - A group of publishers and libraries keeping "a geographically distributed dark archive of Web-based scholarly publications". When content is not available from a publisher (a "triggered event"), CLOCKSS makes it freely available, under a Creative Commons license.