Yes, it's down for a while and they are asking to refer to twitter:
https://twitter.com/#!/blockchain
Just now I needed to receive my payment via BTC and it's down. It should be back within few houes else my wait will increase. This is the third time in 3-4 months.
You can still recieve payments but just use a desktop wallet if you need access to it straight away. BC.info will inevitably have downtown every so often being a third party website so you should have other wallets anyway.
It's up now and working. I checked my balance using blocktrail website and I'm glad that even though blockchain was down, my transaction still got confirmed.
