I am also experiencing the same problem on gutsy with a macbook 1st generation.
Basically after several hours of laptop usage, the touchpad seems have weird 
behavior (moves the cursor to the center of the screen after I touch it, and 
makes the external mouse extremely jumpy), after which I need to either restart 
X (in which case the touchpad will completely stop to work) or reboot.

how can I provide input to help fix this issue ?

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Jumpy trackpad tracking
https://bugs.launchpad.net/bugs/32877
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