New features include the ability to download all of your previous entries, and a quick search to find specific text within those. Yes, we already had this with LJBackup, but that never gave you a working URL for the actual entry, if you wanted to read comments or reference back with a link to it. Here, it's just a right-click option away.
It's a little quirky (it doesn't seem to archive what mood you were in), but there will probably be a minor bugfix release soon. In the meantime, it's still better than whatever you're using.