22:44, December 13, 2011 (UTC)
Recently the latest minecraft prerelease (11w49a) added a 1/200 chance of apples falling from a destroyed leaf block. But what does this mean?
INFINITE GOLDEN APPLES.
These are so hard to find, and are VERY powerful. Before 1.9 Previews, gold was a limited "Nonrenewable" resource. Obviously nobody ever has exhausted their gold supply, but this is possible. (Probably would take billions of years though). Now, you can simply kill a zombie pigman, and get a gold nugget. Nine nuggets= a gold bar, nine gold bars= a gold block. 8 gold blocks+1 Apple= Golden apple. Now, you can have infinite gold apples so you can destroy those pesky creepers.
But what's the most efficient way to do this?
Obviously the timber! mod makes tree chopping easier, Here is the most efficient tree farm setup (Underground). For overground setups, just plop down saplings on every available block.
Here's what I found to be the most efficient gold farm with minimal resource exhaustion: 
As you can see, the gold farm produces gold very quickly, and depending on the size your tree farm should too. You should end up with a significant amount of golden apples.
For a full list of renewable resources, see here.
-- | | | Fun Fact: We are seeing the Andromeda galaxy as it was over 2 and a half million years ago.
19:24, December 11, 2011 (UTC)