Application Icon
You can customize Todo's application icon for the iPhone home screen to show tasks that are due or overdue.
In Todo settings you can customize how Todo calculates the task count on the icon.
Reviews
"...if you're looking for [a to-do app] with more functionality, Appigo's Todo is one of the better options, and it doesn't require a Ph.D. in Getting things Done (GTD) to figure out how to use it...well worth its $10 price tag."
Dan Frakes, Macworld.com
Read the full review
"If it's a to-do list you need, you can't do better than Todo by Appigo."
Lisa Hoover, CIO.com