I’m constantly searching for new ways to manage tasks, but I’m never going to live in any to-do manager. E-mail is the app I live in–and to be even more specific, what I live in is my inbox. I’m far from alone, and a clever new service called NudgeMail acknowledges that by turning e-mail into a to-do manager. (Or, if you prefer to think of it this way, a to-do manager into e-mail.)