HistoryHound is a handy search utility for anyone who does a lot of surfing and RSS reading between multiple apps. It offers a full text search of most of the major Mac OS X browsers including Mozilla's, OmniWeb and even Opera, as well as two of the more popular RSS readers: Pulp Fiction and NetNewsWire 2. It can be called with a keyboard shortcut, or a small search panel can be left to float above other windows, always waiting to do your bidding.
How HistoryHound searches is customizable, as is how far back into the history it shines its spotlight. If you don't like bouncing between applications HistoryHound also includes its own WebKit-based browser for previewing any of your search results.
This swiss army knife of a history utility has also recently been updated to a Universal Binary, along with a few other minor but useful feature tweaks. A fully-functioning 30 day demo is available, while a full license is $19.95.