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It really annoys me when I accidentally scrolled or clicked into something while I’m typing with my laptop. So, I start googling for something to get rid of this problem, and I came across into syndaemon. Syndaemon is a program which monitors the keyboard activity and disable the touchpad while typing. It is included by default in Ubuntu Intrepid.

$ syndaemon -d

 
-d option specifies the syndaemon to start as a daemon and runs in the backgroud. The default idle-time (time to wait after the last key pressed before enabling the touchpad) is 2 seconds.  There are also a few other basic options to suit your needs.
 
-i : Specifies the idle-time

-t: Disable tapping and scrolling only.
 
So, for example, if you want to disable tapping and scrolling only, and 1 second idle time before touchpad is enabled again:

$ syndaemon -d -t -i 1

 
You can also run syndaemon in startup by adding the command at Preference -> Session.