1. Move your bitcoins to a wallet controlled only by YOU. If it's a webwallet like BlockChain.Info it's still strongly recommended to download original Satoshi's wallet software and start downloading 40 GiB of the blockchain. If you leave your coins somewhere on the Internet you may be unable to double them once the fork happens.
Instead of dloading the blockchain maybe we could use an electrum wallet?
And can we expect someone to write a tool to inspect the blockchain and confirm those 'fresh satoshis' exclusive to one chain that someone sent you were actually created after the fork?