I agree with LL.
In my opinion forums are designed for discussions, the comments section of blogs are for just that, comments!!
I appreciate that the main site came first and that is where Keith wants the attention focused, however I beleive it’s not practical to have a discussion in an area that is not designed for it. Maybe it’s because I spend a lot of time on many other forums that I am more comfortable in forums.
The way I think a blog and forum should be dived is something like this, for example:
Blog post about new engine specification, people them comment on the article or links to further information.
Forum post where people discuss whether the new specifications are a good or bad thing and others reply.