From the site:
Most of the time, you punch what you want to know into Google, and you instantly get what you’re looking for. But have you ever had that experience, where you try query after query and no matter how hard you try, you just can’t find what you’re looking for? That’s what this site is for — because the things Google can’t find is more interesting than the stuff Google can find. Click New Entry to add your own entry to our collection of Can’t Find On Google.