Hi, Just a little technical question about Bitcoin-QT,

I noticed when I send some coins to gox or bitstamp, that the transaction is only locally in my bitcoin-qt.
There is no transaction showing up in the blockchain. (even not after a night.)

I checked in qt and my fee is zero for this moment (did not know this option)


My question is, is there something broke at my side, and should a transaction that sent some coins appear a immediatly or a few minutes later unconfirmed  in the blockchain? And maybe gets confirmed a few hours later

Or does my bitcoin-qt have to wait on the transaction delay and can only send the transaction to the blockchain after a few hours / days and appears only after a few hours / days in the blockchain?

How exactly can a miner decide to process a transacion or not? is it a setting or is this setting managed by the mining pools and not by the individual miners?