Goosh, which dubs itself "the unofficial google shell" interprets the idea of presenting a command line interface via a web site literally. The site uses AJAX to present a terminal shell interface to Google. For simple searches, just enter keywords and click Enter. Type h for help with other commands. It even provides history functionality using keyboard up/down arrows.

1. The default screen is literally a command line interface.
2. Help shows available commands.
3. Doing a simple keyword search.
4. A News search.
5. An Image search.
6. A Wikipedia search.
7. Changing settings.
8. A Place search with the new map size settings I modified.

http://www.goosh.org/