For the past couple of years, I have been using a blog engine that I wrote from scratch (login system and everything).  I knew there were a million of these already out there but it was something I was going to use as a learning experience (it was something I was using as a way to learn C#).  It worked great and let me do everything I needed to, however, I have not updated the code in forever. My style of coding has obviously changed a lot since then. Instead of updating the code base to be more efficient and test-driven, I decided it was a good time to stop re-inventing the wheel.  I'm now using Blog Engine.NET.  

Over the next couple days, I'm going to be migrating some of the content over (some of it is just not worth it) and maybe make my own theme.