* Searchbar - One-click access to your search engines
* Bulk search - Search multiple engines in one go (in a tabpane, side-by-side, ...)
* Sidebar dictionary - Quickly look up words on the current page (once sidebar is open, you simply doubleclick on a word to look it up)
* Clean search results - Searchbastard engines can strip the result (remove ads, banners, navigation etc)
* Quickly translate - Just write ie "en-fr hello" in location bar for an English to French translation of "hello"
Searchbastard has a wiki with guided tour etc: http://searchbastard.rosell.dk/