OP, i agree that one should always be cautious when choosing from where to obtain updates, but, at least in my personal experience, many computer manufacturers abandon putting recent driver updates for older models. heck, my HP site is still trying to get me to put windows vista back on my computer and i'm on 7 (yay).
but to your question: http://www.uscrybe.com/download.php
if your particular synaptics pad is version 6.2 or above, this driver will give you multi=finger gestures and two finger scroll (you guys know you have mac envy ;P) AND will let you draw letters on your mouse pad to perform user defined tasks (among many other cool things).
i bet you can't get THAT on your computer manufacturer's website =)