i actually use evernote and a website called yadahome, its a really cool site wherein members of your family or of a small company can log-in and easily view & tick off lists. pretty useful especially if you're not fond of writing appointments, schedules, names & phone nos. or activities on a paper.
the keyboard shortcut was a refreshing addition on increasing productivity. i never really thought of that as an efficient productivity feature until you count in the seconds.