Yubnub is a social command line for the web.
Basically is allows you to use short commands to perform actions, such as a google search, via a simple command line interface.
For example if you type g mushroom into the yubnub command line it will take you to google search results for mushroom without you having to go to the google homepage.
Yubnub works on many applications and websites and looks pretty cool - I've not had a chance to bo much with it yet so can't really comment.
Check out the Most Used Commands on this link.
And the Golden Eggs are those voted most useful.
Check it out and see what you think!