How to enable trackpad momentum scrolling?

[Qusus]

I was playing around with the newest Mac's today at a Best Buy and noticed that they have a feature called "momentum scrolling" under their trackpad preferences.

I have the older 13 inch Macbook Pro's with the glass trackpad, and it appears that feature is not there in system preferences. However, I can't imagine that the slightly older trackpads are not capable of momentum scrolling in Snow Leopard.

Does anyone know of a way to enable momentum scrolling for the previous gen Macbook Pro?

 

[spinnerlys]

http://marcmoini.com/sx_de.html

via Inertial scrolling on 2009 MBP: any hack?
found via MRoogle

 

[TheAssman]

Unfortunately, inertial scrolling will not work for people like us who have older macbooks

Personally, I use http://www.macupdate.com/info.php/id/34010/avescroller . This small piece of software enables inertial scrolling which is nearly identical to the scrolling on the new macbooks.

 

[reubs]

Are there major hardware differences that make this impossible, or is this simply something they're keeping out as an incentive to folks who just HAVE to get the latest tech? This seems like a simple software/firmware issue, but I guess it's really not.