http://librariancentral.blogspot.com/2007/01/thanks-for-feedback.html
All comments must be approved before live in the comment section, though, so there's no chance you can spam it. (You can waste some of the Googlers' time)

BTW, do you notice that the new version of Blogger is very very slow?

All Blogger blogs are slow and it's pretty hard to post something.

status.blogger.com is silent

"Google Library Central Blog Allows Comment"
> They surely forget to disallow that :-P
BTW, as you know, it's not the first official google blog to do that.