Inklet

Inklet allows your trackpad to emulate a pen tablet. When you're using a Pogo Sketch, the trackpad even becomes pressure sensitive.

Features The full tablet - Moving your Pogo Sketch lightly around the trackpad will allow the cursor to hover without inking. Increase pressure to draw; heavier pressure will result in a thicker stroke. Handwriting recognition - Inklet works with the handwriting recognition built into OS X. Use your trackpad to jot notes or doodle. Advanced palm rejection - Inklet includes an advanced algorithm to detect unwanted trackpad touches. This means you don't have to worry about accidentally resting your palm on the trackpad as you draw.