PopSearch

PopSearch puts all your favorite search engines a keystroke away. No matter what web page you're looking at, just press the configurable hotkey (the default is command-K) and up pops the PopSearch search bar. Type your search terms, select a search engine in the menu, press Enter, and PopSearch takes you straight to your search results. (You can also press command-Enter to open the results in a new tab, or command-Shift-Enter to open them in a new background tab. There are settings to change the default behaviors.) If you select some text on the page before invoking PopSearch, that text will be automatically entered into the search input box.