Blogger deploys moderated comments
Blogger/Blogspot appears to have grown a Moderated Comments facility in the last couple of days. Possibly what caused the Blogger/Gmail/Google downtime a few days ago.
Go to Blogger -> Settings -> Comments -> Enable comment moderation?
Then look under Blogger -> Posting -> Moderate Comments
You can also have the comments awaiting moderation emailed to you, though as yet there is no ability to use your email to approve the comments (now that would be a killer feature).