I will never use this. I will so very never use it that I think my mind simply blocked its very existence: it's an Evernote feature that works rather smartly with real-life Post-It Notes. I hate Post-It Notes. I have a think about tiny scraps of paper, makes my skin crawl, and that is one big reason why I got into using Evernote and all things electronic. But it is smart. It is really smart.

Wade Roush is into this and says on Xconomy:

The Post-it Camera is a feature of Evernote’s iOS app (iPhone and iPad only so far) that accesses the device’s camera and helps you take a clear, evenly aligned picture of any Post-it note. It then creates a digital replica of the note—basically, it sharpens up whatever wording is on the note and cleans up the background color. What’s cool is that you can set Evernote to store these digitized notes in specific notebooks according to their color. It’s best at recognizing green, blue, pink, and yellow. (And yes, you’d better believe that this is all a big co-marketing operation: 3M sells Evernote-branded Post-it notes in the correct colors.)

Read his full article for details of how to use this, unless you're me in which case have a skim across the rather long piece for many other Evernote-y and organisation-y gems.