Yubnub
Good ideas are usually pretty obvious, yet no one had thought about it (or acted upon it) before. yubnub from Jon Aquino is the result of one of those shiny moments. It’s a (social) command-line for the web, which means that you don’t click your way through the various webservices you might use anymore, but learn a few commands and trigger the services by typing the corresponding command withing your browser (and hit enter).
This is really fun (and a great timesafer), and there are tons of commands available already (the golden eggs are the most popular ones), but if you are missing something you also can generate your own.