Just save that CAB to your phone, run it which will install the sounds, and then go to Settings -> Personal -> Keyboard Sliding Sounds and they will be in the list.
Has anyone tried this case from Boxwave? It looks pretty nice but haven't seen any reviews on it.
http://www.boxwave.com/products/rubberizedslimcase/at_t-tilt-rubberized-slim-case_2906.htm
Worked fine for me. I saved the cab to my storage card and it didn't work but it did when I moved it to the device. I can't decide betweem the lightsaber and transformer sound! haha