I've played off and on over the years with developing my own blog engine. Why? Mostly just as a learning experience and a place to experiment with new stuff. What I've been finding with most other blog engines (dasBlog used here, Wordpress being the two that I'm most familiar with) that while they have a great number of features, like most software, I only use a small fraction of the features. I want a blog engine that is all my own that has just the features that I want.
I've been inspired to finish it up. Check out this new blog I stumbled upon through a comment in a Hanselman post. Josh took up the challenge to create his own blog engine and I must saythe result is a very clean, nice design. While I haven't seen any of the underlying code, I'm pretty impressed with the end results. Great job Josh. Now to polish off my source (perhaps polish it off just to throw it all away) and get moving on my own engine. Plenty of stuff to learn!