I am in the process of moving my blog to a personal mutation of DasBlog. Already moved all the post and comments over but there are lots of changes to make in DasBlog. I chose DasBlog because it gives me a good excuse to play with ASP.NET and it offers relatively easy migration from Radio. It's pretty slow and code itself is not exactly pretty but I can tear into it easily enough. At this point, I am gearing up to replacing its file-based storage with either Berkeley DB XML or MySQL.
Visual design-wise, I am going to be replacing the calendar with tabs to display the blog in daily, weekly, or monthly views. Daily views will show posts spanning days. Weekly view will show post titles spanning weeks. Monthly views will show post titles spanning a year. Search is already there but I'll have to checkout its performance before deciding to replace it or not. And then there is the legacy URL preserving code so old links don't break. Lots of enjoyable headaches ahead.
I am switching ISP as well, so don't be surprised if the blog becomes unavailable for a few days.