You could try to send email through Acidprime’s account page. He does refer to IrisInk in his CS3 package creation post as “my company”, and IrisInk was where pkggen was.
Looks like someone (perhaps mgb123?) asked for PKGGen in the ME.org mailing list. A valid download link is 3/4 of the way down this thread (spam filter is getting to me tonight–sorry for the odd spacing):
groups . google . com /group/macenterprise/browse_thread/thread/f9b5ee6b2a8117bb?pli=1