piuk has also contributed a patch for MultiBit so that you can import blockchain.info wallet backups into MultiBit.
This includes the encrypted and double encrypted ones. It is included in the current release on
http://multibit.orgDue to how the data is stored, it needs a full replay of the blocks to get the balance (say 2 hours on wifi) so it is more a "get out of jail free" card than something you would use day to day.
Still, useful as a backup way of accessing your BTC.
The how-to is
here.