Easily the best blogging framework out there, not to mention it's completely free
This site is suported on blogengine.net and I can't say enough good things about it! Off the top of my head, let me try:
- automaticaly updating RSS feeds and sub feeds
- auto updating sitemap
- incredible interface
- completely customizable
- constantly developed and maintained
- great community support
- windows live writer support
Anyways, if you are looking for a blog framework, you can't go wrong with blogengine.net.