Required link to related xkcd strip: http://xkcd.com/657/
Check it out: http://www.preceden.com
Just some feedback lower the barrier to entry. From the initial look of it, it seems like it would have a steep learning curve.
Your stats look great though. Spend $60 and get $145 back, you are on to something.
The $5/day the led to that $60 didn't result in any paying customers, so I stopped. Blog reviews and word of mouth are much more effective.
As far as usability goes, it should be pretty easy to use. There are advanced features, but for a simple timeline, you should be off and running in minutes.
Hope you like it.