http://d46a7e5t3rtanpdibso6ekzg2b6san5kcsc6wjrdro3wxlvlycdkmbid.onion/faq
With the standard bitcoin.org client you will need alot of knowledge about how to protect your wallet.dat file, which is basically impossible for most normal people who dont run multiple PCs, virtualization software, encryption tools etc. Also if you don't do regular backups on the standard client, there is a high risk of loosing your coins.