iPhoneunlocking Delays iPhone SIM Unlock Application [updated]

UniquePhones, the company behind the website iPhoneunlocking, delays the release of the iPhone SIM unlock application after receiving letters from AT&T lawyers. The delay will be used to ensure that such patch is not illegal (originating from reverse engineering) even though it breaks an exclusivity agreement between Apple and AT&T. One legal point could prevent UniquePhones to sell this patch, but not to release it publicly.
Another company preparing its own application to unlock iPhone SIM, iphonesimfree, might have also received similar letters from AT&T lawyers, even though it did not communicate about it.
[update]
One of our valuable readers, Dana, sent us a link related to on-going actions driven by Apple and AT&T to block distribution of instructions/software for unlocking the iPhone so it can be used with other carriers: http://www.macworld.com/news/2007/08/27/dmca/index.php