With Wunderlist we've already seen many repeat users and have daily users adding new tasks, especially during the week. With Wunderlist 2 we will have more features that will help grow this.
Fred Wilson wrote about user metrics, he called it the 30/10/10 rule (http://www.avc.com/a_vc/2011/07/301010.html) - 30% monthly active users, 10% daily active users and 10% new users each month. We can apply this rule to Wunderlist, but as we're in the 'task' market, we generally have more monthly users than daily users - because the product is more optimized for weekly use.
