Nothing fishy went on. This is the result of two things...
a currency with more open shares x value then it's real value
and
someone typing in "sell 1,000,000 BTC for 0.01" on MTGOX
Simple as that.
If you just happened to have a bid in for 200,000 BTC for $0.1, then your order was filled.
Ya, looks like someone bought everything on the table.