Goto http://satoshidice.com/ http://satoshidice.com/ and look. They have pre-calculated addresses that all start with '1dice' and payments to these addresses a

Goto http://satoshidice.com/ http://satoshidice.com/ and look. They have pre-calculated addresses that all start with '1dice' and payments to these addresses are considered a bet. The miners are not really filtering satoshidice, they are filtering all transactions that start with '1dice' this includes them and a tiny number of false positive matches.