New Blogger: Label Lots of Posts

I stole this from a comment that "Mommy Dearest" left at the Beehive:

You can add categories without having to republish your posts. If you open the "edit posts" screen, you can put check marks in the boxes and pull down the "label actions" menu at the top to apply the category labels without even opening the posts. It's handy for applying a bunch of categories at the same time.

It worked great! And I also discovered that, although Blogger only likes to show 25 or 50 posts at a time for editing, you can choose the option to display 300 - and, if you have over 500, like I do, you can cheat by typing in the number of posts you have in the URL so that blogger has to display all of your post titles on one page. Very handy for batch labeling!