I found this app that works really well as a to do manager. It works by swiping, and is so simple and fast.
http://www.windowsphone.com/s?appid=3c5ea9f4-91ea-4e1b-83a5-62d9d18003ef
http://www.windowsphone.com/s?appid=3c5ea9f4-91ea-4e1b-83a5-62d9d18003ef