I just got an letter from them a few days ago. They reached their goal of 500,000 sweaters so they have now turned the program over to World Vision (one of their partners). They believe they will have the resources and ability to reach more children than Guideposts alone did. the new address for sweaters is -
Knit for Kids
C/O World Vision
210 Overlook Drive
Sewickley, PA 15143
The letter doesn't say anything about the website, but I assume once they get their ducks in a row they'll open it or a new one again.