Now and again I buy something small on Amazon or Ebay that just blows me away in terms of its usefulness. By far my favourite gizmo this year is a little stand for my phone. It's so handy at meal times to be able to read news sites or a book on my Kindle.
Yeah, you could just lie a device flat on the table but then you are vulnerable to spills, harsh overhead lighting, etc. I used to buy the odd paper or magazine but now there is simply no need.
What little thing did you buy that took you by surprise?