Posted by Agent Davis on 10, 2000 at 5:37 AM:
This sounds like a really good way to do a trackball.
Here are some sites that sell it, I have no idea about the quality of thes vendors. Just did some searching on the search engines:
http://www.codemicro.com/cat2/content287.html - $31.17
http://www.novabiz.com/mfg186.html - $29
http://www.gy.com/company/genius_brab.htm - $33.06
And In the UK....
http://www.rm.com/products/spa/periph/tabletsnew.htm - 18.95 pounds