Minecraft 1.0 came out.

[Hippo]

Arrows seem to loose momentum more quickly.

And either they increased the health of creepers, or arrows don't deal as much damage anymore, since it takes 3 fully-charged arrows to kill one now instead of 2.

They increased the health of all mobs, I believe.

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And there's a bug that I found in 1.8, where you destroy your bed whilst sleeping in it, then torches, paintings, doors and corners suffocate you.