This site is fantastic if you need to look something up and you don't have a concordance handy. You can also type in the name of the book and the entire book will be listed for you. Excellent if you want to look up a verse or do some reading. The site also has several different translations available and is available in different languages as well. While not really a search engine, Yahoo provides the most well organized and most comprehensive topical break down of the World Wide Web.
Search results return sites that have been registered within their catalog of the web.
If a search yields no returns from their catalog, information from an external search engine is imported and presented to the viewer. This is one of the more comprehensive search engines out on the web. They've got some additional features that the other engines don't have too. One such feature is the incredible Babelfish engine. This is very cool if you have research to do and you find that your topic is covered extensively in a foreign language.