You can't use them where you're going, but back here, your organs could save the lives of others. Now is the time to sign up for the Colorado Donor Registry, created by the Colorado Legislature in 2000 and officially up and running as an electronic database on November 19, 2000. Those who marked the appropriate spot on their driver's licenses are already on the registry; those who sign up on the Web site will be added -- quickly, since time is of the essence. More than 71,000 Americans are waiting for organ transplants, including 1,200 at Colorado transplant centers; in 1999, more than 6,000 Americans, 63 of them in Colorado, died while waiting.