To everyone QQ'ing over non-retroactive books, do you realize it sounds like a noob saying, "Giev monies plz!"? If they did make the boks retroactive, a ton of gold would have hit the market instantly. At least this way, now everyone is on a equal playing field to filling in their books and receiving their rewards.
To the one who said that, "...achievements aren't meant to be all fun", I feel sorry for you.

I can only hope that you find video games fun again some time soon.
Anet did a wonderful job with this update and I'm sure they're still looking over things in case they need to iron out anything.
P.S. Does anyone know if the Turtles from the Jadeite Summon Stones use Siege Turtle Attack at all? I'd make one myself but jadeite is in short supply so I can't get my hands on one yet.
P.P.S Can't wait for Wintersday now!