The other day I stumbled across this Webkit plugin for Disruptive Footnotes - which is so brilliant I am perplexed how it had not been done before (it makes footnotes actually usable on the web instead of just annoying text you find in the footer). Turns out, the smart folks behind that plugin also run their own Open Ideas blog full of similarly clever ideas - like Cloud Clipboard or a Smart TV. My only complaint? The ideas are so good that I want more ideas.