They appear to have reported a problem on Twitter though:

Blockchain.info ‏@blockchain 5h
Having a few issues with Bitcoind, blocks might be lagging for the next hour.
Details 

Roller-coaster being a descent descriptor: look at that graph!

Does the possible output outweigh the electricity bill?!

It's been five hours for me!

Indeed, it hasn't updated for over five hours.

Probably not much use but blockchain were allowing Pingit transactions until relatively recently, as far as I understand it.  Probably safer; shame it's been discontinued without any word as to why.