The Unofficial Google Shell
I have stumbled upon this a few weeks ago and have been enjoying using it very much. Mainly because I like typing commands and having my hands on the keyboard all the time.
Google Shell is an unofficial google command shell which allows us to search the web, images, blogs, news, video, etc just like the normal www.google.com search page. The only difference is the interface is much more simpler and easier to use (if you like typing commands).
The developer of this wonderful tool is Stefan Grothkopp and he coded this on top of the Google Search Ajax API
For starters, type "h" or "help" to get a list of commands.
To search, just type the keywords and enter. A list of top 5 results will appear. To go to one of the top 5 results links, type "read [no.]" and a new window/tab will appear or type "go [no.]" and the current tab/window will be redirected to that result page link.
For more results, type "more" and more results will appear.
Give this a try for all you command prompt geeks! :D

