If you enter your search term at Langenberg.com the words automatically fill in search boxes for a number of different search engines (once you hit "enter" or "Go"). Then you can choose which one to actually use by simply hitting "Go". If you hit "R!" it deletes the term from that single box. So you only need to type the term once.
Langenberg screens the sites they include, selecting only those that take you directly to links rather than first requiring a log in. It specializes in search forms.
Langenberg is also a useful foreign language translation tool and includes mapping sites, too.