dont care what size, and maybe I just need help on what to search for in google, but Im looking for something that goes over your screen, and plugs into usb, for awesome touchness.
This sort of thing is available and as you say Google is probably the best option.
With the integration of touch into Microsoft's New Windows 7 operating system, due for release by early 2010, it is likely that they will become more available over the coming months, As they become more popular prices will also drop so it may be best to monitor the situation for a while and see what develops