What spam protection is provided by BlogEngine.Net for comments?
In CommunityServer there is a pretty good engine that marks spam as such, holds questionable content and publishes good posts (not sure how their logic works but it does a pretty good job!)
Is dasBlog there is support for Askismet and some other spam detection and again it seems to do okay.
I've not had a chance to dig into BlogEngine.Net much to see what it currently supports but there's nothing in the admin interface I can see that will let me review/delete comments in a managed way.
IMO this is more important than a lot of other features to keep a blog under control!