The new blogger interface, that is. I always worry about software 'updates' because they are often nothing of the sort, but it is a lot easier to read my followed blogs and look for interesting stuff. The post window is cleaner, although I personally think it should default to the full screen...it would look better that way.
My only issue is that tags (labels) don't appear automatically, but you have to click on them. As I'm horrible for forgetting my tags, this is a bit of a downside. But otherwise, kudos to Google for an upgrade that really is.