Stickies with tablet support and reminders.
SketchBox is a Sticky Notes Manager that supports graphical and text notes that can be used as reminders.
Notes can be arranged via drag'n'drop in the thumbnail view.
Each Sticky consists of three layers: The drawing canvas, a little text editor and an intuitive alarm timer that combines analog and digital elements.
While editing text the drawing layer is still visible in the semitransparent background and vice-versa.
You can stick individual notes to the Desktop if you don't want them to clutter Exposé or make them appear always on top for important things.
The drawing canvas has extensive support for graphics tablets with pressure sensitivity and you can use the backside of your pen as an eraser.