You might want to check bitcoincharts.com
If it being sent you may be able to see it there. Just search for your address or transaction ID. If it shows the coins going to your wallet, then you probably just have to wait a bit. That is especially true if you did not include a fee. 3 hours is too soon to panic.
ty, i sended it with the fee.... i just find no reason why it takes that long.... wether on bitstamp, blockchain or any other it took that long!!!
I sended an other small amount and it was done immedeately....