I logged in to check my account tonight and saw this message:
Starting 2/14/2015 we will begin a systematic shutdown of our mining pools. All SHA-256 pools and some scrypt pools will be turned off on 2/14/2015. The remining scrypt pools will be shut down 2/18/2015. All balances will need to be withdrawn before 2/28/2015.
We thank you all for your support of our service and wish you all the best of luck in your future mining.