When you think of front-end web development, what icons do you immediately associate with it? For example; microformats. The machine-friendly mark-up structure, that helps machines and humans get access to data, such as a persons contact details, quickly and easily.
Painfully, I think of the RSS, xHTML Valid, CSS Valid Buttons. Also I see Digg and Stumble Icons, and about 1000 other ones. Too much repetition in this world... and too many ways for people to "prove" themselves