A few days ago I noticed this site had stopped being indexed in Google. It turns out that when I had upgraded to the new version of Blogger, it inserted new code that essentially told Google not to index this page. This is only supposed to happen in Blogger if a blog is set to private, which was not the case with mine. Marketing Pilgrim had an excellent post about how it sometimes sets meta tags to "NOINDEX, NOFOLLOW". I've removed the bad code, and hopefully Google will be reindexing shortly.