A Longitudinal Study of Web Pages Continued: A Consideration of Document Persistence: Wallace Koehler, Valdosta State University, presents the results of his research, and an overview on existing literature. Published in Information Research, Vol. 9 No. 2, January 2004.
All Things Web: How Much Is Too Much?: Results of the third State of the Web Survey (SOWS), an automated web survey that tracks page size and linkrot on the WWW.
Altertbox: Fighting Linkrot: Jakob Nielsen defines the phaenomenon linkrot, and encourages site owners to fight it by reducing outbound linkrot and securing stability of incoming links.
Cool URIs Don't Change: An appeal for stability, and advice how to achieve it, by Tim Berners-Lee.
Link Rot: Overview article from Wikipedia.
Linkrot and Legal Research: An overview on results of recent research by Ted Tjaden.