How do you keep track of your events & Tasks with your windows phone?

What apps do you use? Been looking for a way to keep track of tasks. The Calender is great for major events, but doesnt do a great job with Todo/tasks, and doesn't show multiple events very well.

So, What apps do you use, and how do you use the to prioritize your tasks and events?

Please explain,as this might help people who have come from IOS and Android, which has reminders and widgets showing all their tasks/ Todo items.