Today's Friday Favorite is a new one to me, but it's been around for a while. I just picked up the latest version of HistoryHound from St. Clair Software -- more famous, probably, for Default Folder X -- and have been using it constantly for days. Its hotkey already has its own spot in my muscle memory. Here's what it does:
HistoryHound indexes bookmarks, history and cache from all of your browsers, with presets for Camino, Firefox 2 & 3, Flock, iCab, OmniWeb, Opera, Safari, Shiira and URL Manager Pro. It means being able to bookmark willy-nilly in any browser and know that you'll be able to quickly locate noteworthy sites again, in any application.
Not just the bookmarks, though; in the background -- with a very low footprint -- HistoryHound starts indexing the full text of each page. Then you can search for exact or fuzzy matches, or with Spotlight-style boolean keywords for any text on the landing page. Search comes in two flavors: a tiny popup panel which can be assigned to a hotkey and provides a list of matches as you type, and a full, Webkit-enabled search window with page previews and a multi-column result list.