Dreamboard - DreamBoard lets you take control over the homescreen of your jailbroken iPhone.
Todoist - Todoist is a to-do list that helps you get organized, at work and in life.
Lockinfo - You can find this app in Cydia - Tweaks.
TaskPaper - Plain text to-do lists for Mac
Springtomize - Tear down the walls
Microsoft To-Do - Task management tool