As the tx-timestamp may not be "tamper-proof" (could be set back to a date whose secret number is already known) it is necessary for any gambling site to pick the date where *it* sees the tx. However this indeed leaves a cheat-hole, as mentioned in:
red flag
The site operator can easily delay processing transactions until the current time [rem: or date] generates a losing secret.
Is that the end of the "no cheating possible" gambling-claim in bitcoin world? Especially in the context, that it actually happened recently, that bets were spent rather quickly (so the tx obviously reached btcdice's wallet in time), but "processed" with one or two days delay. That doesn't look at all well, BTCDice :-(
We should really have an eye on how long it takes in average to process bets, and how long it takes till the bets are spent. Losses paid instantly do not count to the average. Also the chart of recent wins is not reliable, as that could (in principle) be "firends' or own bets".
PS: @22bones: "independently" meant "not in the same tx".