FedEx Day is an idea put forth by the fine folks at Atlassian. At NUBIC, the department I work in at Northwestern University decided to try doing a FedEx day of our own. It wasn't long before the project idea discussions started, and people wondered, "Wouldn't it be nice if we had a place to post ideas and get feedback?"
A couple days later, the fedexday app was born - a very simple, no frills way to post an idea, and get feedback.
Below is a quick screen cap that gives you an idea of what the interface looks like. So, if you want to run a FedEx day at your workplace, now it's as simple as spinning up a small Rails app.
Users don't need to log in, and all submissions are anonymous by design. Simply post an idea, and others can comment and endorse the ideas to give you a rought measure of the level of interest. Everything in the app is free-form wiki style editing without restrictions.