Internet Archive: Wayback MachineSearch for archived snapshots of expired websites and blogs.
This is a great tool for hunting down website information from the recent past (from 1996 on) that is no longer maintained on the web. The Internet Archive uses web crawlers to take selective snapshots of a wide array of websites and stores them for review even after the sites have been taken down by their original hosts. Note that it only covers a sampling of sites, and the frequency of snapshots is sporadic, so you will not always find what you're seeking.