makeuseof.com posted an article that shared some insight on the following multi-search engines.
Search Hacker (NSFW!)
SearchHacker hosts 15 different custom search engines from its homepage: Real Estate, Baby Names, Webcams, Audio Files, Jobs, Video, Wallpaper, Free Stuff, Questions & Answers, Product Prices, File Search (with filetype filter), Passwords, and BitTorrent.
Unfortunately, the first of the engines listed is an adult image search, featured prominently on the homepage alongside a troubling image of a Disney Princess character (!), so I cannot suggest using this site.
Yahoo! Glue
Yahoo’s Glue returns multiple types of search results, such as videos, news, images, and biography, on one page. The odd thing is that many of these results come from non-Yahoo sites like YouTube and Last.FM. There’s no plain-vanilla Web search with Glue, but there is a handy Yahoo search box in the upper right.
Serchilo
Serchilo can be thought of as a command-line interface for Web search. For example, type “g keyword” for a Google search, or “g! keyword” for an “I’m Feeling Lucky” search. If you’re shopping, try “a keyword” for Amazon or “e keyword” for eBay.
Once you’ve memorized the commands, a search plugin is available for your browser. If you register, you can create your own commands.
Katapulco
Katapulco wins the multi-search game hands-down because of its quick and simple interface and availabilty of over 90 search engines from a single command line. It uses a shortcut system much like Serchilo, but allows for its users to create custom commands without signing up for an account. Use of more than one shortcut at a time is possible, and such results appear in a tabbed interface.
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