The latest manufactured iPhone 3GS devices seem to contain new bootloaders, which can not be compromised using the 24k bug. Although Musclenerd of the iPhone Dev Team paints a dark future, Mathieu Hervais expects that there are still ways thru the chain of trust in order to jailbreak.

Picture is courtesy of Mathieu Hervais…

P.S. To find out which Bootrom your iPhone got, just get yourself a Mac and check system profiler while your iPhone is in DFU mode.