Multi touch for any,all synaptics touchpad | ubuntu snippets
http://ubuntu-snippets.blogspot.com/2009/03/multi-touch-for-anyall-synaptics.html
touchfreeze - Project Hosting on Google Code
http://code.google.com/p/touchfreeze/

Annoyed when you are typing a document and accidentally the palm of your hand brushes the touchpad, changing the position of the cursor in your document or accidentally clicking on an option. TouchFreeze is simple utility for Windows NT/2000/XP that solves this problem. It automatically disables touchpad while you are typing text. Like syndaemon on x-windows.

Utility for Windows that disables touchpad automatically while you are typing text

Freezes your touch pad when you begin to type, unfreezes when you stop.

Desactiva el touchpad cuando empiezas a teclear y lo reactiva en cuanto dejas de hacerlo!