Even though Minecraft 1.0 is essentially no different than RC2 (which in itself wasn't THAT much different than the 1.9 Prereleases), the fact that Minecraft has hit the 1.0 milestone makes me so incredibly happy and proud of Notch and his team.
(Shameless plug: I made a short little tribute to the Beta -> 1.0 transition, if you guys want to check it out (there are explosions! Lots of them!)
http://www.youtube.com/watch?v=PZ1Fa...ure=youtu.be&a)