How do I import to MultiBit from Blockchain.info?
Step one : Update your Multibit, normally since 0.3.4 it can import Blockchain.info
https://groups.google.com/forum/?fromgroups=#!topic/bitcoin-multibit/G87Y3e1-0Ak

Anyway, if it's not working you can try this :

Go to Import/Export in Blockchain.info

Now "Export Unencrypted", change Base58 by Bitcoin-Qt format and take the key after "priv".

Now go to Multibit and EXPORT (yes export) your wallet WITHOUT password.
Edit the file exported and you'll see several lines with ADDRESS (whitespace) DATE

Replace address with the blockchain's address. Change the date by the date you created the account (or a few time ago).

Now save and import this file in Multibit, et voilà !