Also, 1.5 should come out next week. Bullet points include:
Weather! Snow, rain, lightning. Expect more mob action during the days... And possibly all your buildings burning down. Woo.
Booster and brake minecart tracks. No more kludges with doors and extra carts. No word on if the laggyness will go away, though, so there still may be disapproval from the server admins.... If not, mass transit, here we come!
Stats and achievements.
So many new toys!