We have over 80% of our Bitcoins in offline wallets at the moment before the attack. We had to keep a large balance because the withdrawals are huge!
use mtgox code for any withdrawals above 500 btc /24h
that or better, as a customer I would accept that any withdrawal above 100 btc / day will be delayed up to 24 hours, ( only 100 /day/customer is immediate ).