One complaint about Blogger's new set-up

I've been signing into my Blogger account with my Gmail address for the past few weeks, largely without any noticeable difference in quality, but with a few handy new features, like Labels. Sadly, I have noticed a particularly annoying glitch that I'm surprised the Google/Blogger team hasn't fixed: if I try to post a comment to a friend's blog without having signed in to Blogger yet, the comment is lost during the redirect to the sign-in page. I've lost maybe a dozen comments this way.

Anybody know where to report bugs?