Does it have to be ASP? When I was looking around for an ASP blog script, I had a real nightmare finding a good package. I was getting to the stage where I thought I might as well build my own. But then I thought I might as well go for a PHP option such as WordPress and learn a new language.
If you're set on using ASP, have a look around Hot Scripts.
When I was looking for an ASP script, I was purposely looking for a Standards based system and not a table-based script. I had seen the potential with WordPress and other PHP blogging systems so I knew it was possible. I just didnt see the point in building an ASP script from scratch when there must have been a Standards one available. I did find one but I forgot to bookmark it. It wasn't on commercial release so I contacted the lad who had built it and he said he'd be happy to share for some credits. I didn't hear any more from him after that email.