Xatrix' Ryan "Ridah" Feltrin sent along an e-mail letting us know that he's released the version 1.21 patch and SDK for Kingpin (they're available for download at 3DGamers). Here's what he had to say:

The Kingpin v1.21 patch and SDK is now available.

While this is an official patch, it may not work it's way onto the "official" Kingpin page at Interplay, due to circumstances out of my control. So please spread the good word my friends.

Unfortunately my Linux box is unavailable at this time, so the Linux port will be somewhat delayed.