So, this might not be a very big deal to anyone else, but it's huge to me - at my workplace, we're now usig the app I built for signing in visitors!!!
It's a simple enough app, a visitor enters their info; name company and contact person, and an email is sent to that person. It might not be revolutionary to man kind, but it's such a thrill seing it used, knowing that I built it!
I keep walking past it, and can't help but smile every time. Apart from personal websites and such, it's the first thing I've made on my own.