Wow, I love to double-post. Legally. :P
I'm loving these new weather effects, I saw rain in Minecraft for the first time today:
I also found one of these:
I was looking up how to use note blocks on YouTube, but I didn't expect to find stuff like this:
And is it me or are mobs far more numerous and aggressive now?
EDIT: Something not worth a triple-post for, a screenshot from my testing map. I cheated to get the wool for this so there wasn't much effort involved:

If the multiplayer server ever comes back, maybe I can recreate it there if you'd like.