Today I sent all of my Ethereum to the Poloniex wallet and received the equivalent in Ethereum Classic. It was great because I have cut some losses I had because of the DAO attack. I will explain how to do it.
1. First check your balance on the old chain here. http://gastracker.io/addr/******
Simply replace the * with your Ethereum Address.
2. Login into Poloniex or create a new account and deposit your Ethereum on the Poloniex Main Chain Ethereum Address.
3. Now you need to wait a few minutes and your deposit will show up on both chains.
4. Sell or wait!!! and Party!!!