Just found some awesome news about Sin City 2 & 3! (I only thought they were making a 2nd one).

"Now for the news that I'm sure most people will agree is absolutely great. Robert Rodriguez will be shooting back to back sequels for SIN CITY 2 and 3 starting February of next year for a release presumably summer of 2007. I guess the studio big wigs were satisfied with the commercial and critical appeal of the uber-cool SIN CITY that they jumped on the shooting back to back sequels bandwagon"