Found this when I was browsing the downloads section of TheHistoryStudentOnline.
Basically, this software lets you construct historical timelines, could possibly be used for archaeological reports as much as family trees, and looks interesting.
Although the homepage mentions "Free trialware", I'm led to believe the full package costs $30. Not too bad I suppose, but until I work out whether I can actually download it free for a testdrive, I can't really be more specific about the product.
Does look promising though:
www.timestripes.com
Regards,
Gordon