History Search - History Search remembers what's on all those websites you visit so you can find them again.
Distill - Tracking website updates, automated and simplified
Better History - Your Chrome Browsing history. Better.
Reddit Check - A tool to check if a URL is on Reddit and going viral
Ruin My Search History - Ruin your Google search history with a single click
FeedMail - FeedMail sends you updates from your favourite websites directly to your inbox (or filed nicely into a label of your choice).