The Data Rescue Project is a good place for researchers to find missing federal data. They can also look at the Current Efforts page to see what is currently being scraped and deposited into ICPSR or another open access repository, and they can go to the FAQ page if they would like to get involved with the efforts.

The UNLV University Libraries is linking to widely known efforts on the Libraries Data Services webpage, which links out to several other related resources. The Internet Archive is another source that is capturing web pages as people submit them for archiving.