melon 

Melon is a personal information manager. With this tool, you don't need to worry about where you stored your credit card payment confirmation number, which websites you wanted to forward to your colleague or the location of the file containing that code snippet you now need to reference.

Once you've added items to it, Melon will hold the bits and pieces of information you define until you're ready to reference them at a later date. If you created a task, Melon will gently alert you when the deadline is approaching.