Are you using a client that lets you spend coins on 0/unconfirmed? (e.g., Blockchain.info/wallet?)
Anyway, the problem is the coins that are used in that transaction themselves had not confirmed.
So, it will eventually get sorted out -- probably by SatoshiDICE re-creating payout transactions. As a result, the transaction you see will probably never confirm, you'll get a new payout transaction.
That could take a full day for them to do that.