Wolfram Alpha and the search part of Google/Yahoo! - also bing. These do more than just regurgitate data. They do useful things, such as compose summaries, sea

Wolfram Alpha and the search part of Google/Yahoo! - also bing. These do more than just regurgitate data. They do useful things, such as compose summaries, search and analyse the links etc. Most of the others is simply a "SELECT * FROM TABLE" for each page.