I recently signed up for Pinboard, the self-proclaimed “social bookmarking [service] for introverts”. Like other social bookmarking services, it lets you… bookmark stuff. But it has a special archival feature that makes it really stand out. All accounts can be upgraded to archival status for $25/yr (minus the initial signup fee of $9.21), unlocking bookmark archival and full-text search. Any pages you bookmark are automatically crawled and their content archived, so that if they ever go offline their content will still be accessible through Pinboard.