I'm using version 0.95 of .Text as my blog engine. It looked like the best of the bunch from my fairly brief look into products in that space. It's OpenSource and uses ASP.NET and C#.
The author, Scott Watermasysk has a pretty good blog and some info on installing and using .Text. The main technical issues that I had installing .Text were:
insert into blog_config (username, password, email, title, subtitle, skin, author, application, host, timezone, lastupdated, flag) values ('admin', 'admin', 'your@email.com', 'Title', 'Subtitle', 'simple', 'Your Name', 'VirtualDirectoryName', 'distribucon.com', getdate(), 5)
Disclaimer The opinions expressed herein are my own personal opinions and do not represent my employer's view in any way.