We are offering zero-spread on Bitcoinica again for the next 12 hours to thank you for your kind co-operation in our bad-tick-incidence a few hours ago.

The rules are the same as before, just market depth, no mark-up spreads. We will pay Mt. Gox fees for hedging ourselves.

In case you didn't notice, we have already sent out compensations of $0.80 per BTC for all liquidated short positions. You can check your ledger for that.