For years I had an Excel spreadsheet that I used to track all of my personal projects. It worked well but had a few manual elements that always bothered me. I thought about converting it into a web app several times and finally got around to it. NextStep is intentionally a fairly simple app - I used it to learn Rails so you may notice some evidence of that.
NextStep is based on several of the techniques I learned from the book Getting Things Done by David Allen. The main two are the breaking down of projects into discrete, bite-sized steps, and prioritizing the next thing that needs to be worked on based on a combination of Importance and Urgency.
I used Twitter Bootstrap for the styling, as all web apps created in 2011 were required to by law.
You can try it out here.