Hi guys, I've been having the exact same issue as you all describe, I am using a Toshiba Satellite L300D running Vista.
I tried everything I could think of to resolve this including things mentioned in this thread eg draining the "flea power" but nothing worked. I stumbled upon something suggesting to clean the touchpad using window cleaner, and low and behold ever since *touchwood* the touchpad has been fine no sign of any erratic behaviour at all. I'm kicking myself over it being so simple!
Give it a go guys!