How does the keypool feature work and why is it safer?

No, it is not correct. It should be:

• send some money
• be sure got it
• close Bitcoin
• backup wallet
• send some money
• ...
• send some money
• lost your wallet
• restore from older backup

Yes. I just wanna say that user should backup wallet only after he/she got at least one transaction in 0.3.14.

In this scenario:

• backup wallet
• send some money
• keypool created
• lost your wallet
• restore from older backup

user will lose money in 0.3.14 too.

Added: the transaction is not required, enough to request a new address once and the pool will be created.

You must have a fast finger :-)

Hope it wasn't a big problem.

Satoshi, could you tell me of what revision is this version ?

I tried diff-ing the files (from SVN and from the binary package with sources), but there seems to be some kind of binary differences in the files, and they are marked as different when doing directory compare, but diff software cannot pinpoint what are the exact differences !!

That is the weirdest thing i have seen in a long time.
Perhaps the files from the package are encoded in UTF-8, UTF-16 or something ? In SVN, they are noticeably smaller.

It is SVN revision 171.