The two transactions are almost exact duplicates of each other (identical inputs and outputs), and were sent within minutes of each other. Looks like your client somehow glitched and sent the same transaction twice. The first transaction has been confirmed, and SatoshiDice has already
paid out on it,
so you should have two confirmed transactions in your wallet: one for -
BTC3.005 and one for +
BTC4.012196. If that's the case, you've got absolutely nothing to worry about. However, if you have an extra -
BTC3.005 transaction which is unconfirmed, you will need to remove this transaction from your wallet (exactly how to do this will depend on what client you're using).
Note that since both transactions have identical inputs, and one of them has been confirmed, none of the coins still in your wallet are affected, however you shouldn't try moving your entire balance to another wallet, as the extra transaction may be causing your client to display an incorrect balance. Please tell us what client you're using, and exactly what transactions are appearing in it.
