Whenever I'm looking for something on the workings and rules of Stack Exchange or Stack Overflow that I know I read somewhere, the first thing I do is go to my favourites here on Meta Stack Overflow. Not there. Hmmm ... let's search Meta Stack Overflow, maybe I didn't put it in my favourite list. Still, not quite. Maybe it was on the blog somewhere? Yes!
I think the blog has a great deal of information that could have been posted on Meta Stack Overflow, because it contains lots of stuff on how the site works and why.
I also came across several questions I'd also have asked (if someone else hadn't done it for me already), and often the answer said "that's over on the blog".
I think it'd be a good idea if certain blog posts could be marked in some way, so that they would automatically appear here on Meta Stack Overflow. That probably would reduce the amount of questions for stuff that's answered "over on the blog". The only issue is, since the blog is read-only, the meta-post corresponding to it would have to be protected from editing in some way I guess.