A cool new LJ tool I'd like to see

By the way, I was thinking it would be cool to be able to see a mood calendar. Use their css, just like the calendar that shows a clickable number of posts in the day, except populate it with the mood icon (in the person's own set) for the post that day. If there are several, you can either show several little ones or show only the one that is used the most and then put a + by it.