My company uses a service called Motivosity. Every employee gets $10 to give to whomever they want throughout the month in as little as $1 increments. Give it away or you lose it. Someone does something nice for you or something cool, hop into the app, write it up, and give them a buck or two. The dollar amount isn't relevant, but the recognition is. And it's easy to do so folks really do it.
I love it.
My work has a similar app called "High Five". These are great for three main reasons:
That's a great idea!
We're a place where coders share, stay up-to-date and grow their careers.
We strive for transparency and don't collect excess data.