This Firefox extension takes a stab at solving a common Web problem: finding again that which you had found before. WebMynd adds two very useful functions to your browsing: site-by-site recording of where you've been, and integrating your history and Delicious bookmarks into specific Google searches. It's the Back button with brains.
The site-by-site recording creates a timeline view of your browsing and a photo browser-like display. Want the site you found Friday after lunch? Rewind using the Reel view. Looking for the site with the purple logo thing? The Grid view is good for your visual memory. Since you might not want a record of every single site you visit, WebMynd lets you add sites to a permanent "do not record" list and zap specific site records.
There's a small performance hit using WebMynd--on the order of 100-200 milliseconds for complex sites. WebMynd keeps your last 30 days worth of history. We were impressed with the way it merges a relevant list of sites you've visited into your Google searches, and a rumored update should include Yahoo BOSS search results in the near future.