Greg Linden write about a topic which is hooeey webprint’s raison d’etre: finding stuff that one has searched for or has seen before.
Greg quotes a 2010 paper by Microsoft Research:
The most obvious way that a search tool can improve the user experience given the prevalence of re-finding is for the tool to explicitly remember and expose that user’s search history.
We believe that a tool that can not only remember the user search history, but the user’s web history can be more effective. An astonishing 40% of searches are in fact re-searches (trying to find a page that the user had seen before) hence there is a strong case for re-designing search engines or building specialized applications to better support re-finding efforts.