Thanks for taking the time to offer feedback. It is definitely niche-ish. I don't expect this to turn into a billion dollar company. But a few thousand or so paying customers would be nice!
I am thinking the following markets:
1. Company history timelines (for company's celebrating an anniversary) 2. Educational timelines for use in schools and universities 3. News timelines created by journalists covering a major new event 4. Legal timelines 5. Personal timelines