robint,
In answer to your question, the Z is still being produced but for the Japanese market only. They are, however, converted to English and exported by several companies to U.S. & Europe which you will find if you search through these forums.
What I want to know is why won't Sharp add wi-fi to these new C models? Does it really cost that much to include? Would Salaryman be offended if the Z came with wi-fi and he had no use for it? He might find it useful if he went overseas on business trips. Sharp knows third party exporters are shipping a boatload of these to the rest of the world. Just toss in wi-fi on the highest level model and charge a little more. I'd buy it & so would many of my geek brethren.
It's too bad they didn't further develop that cellphone. In its prototype state, it was committee ugly, but it had great potential. I guess it was a "safe" move on Sharp's part to axe it, but the future is in smartphones, not PDA's. They are going to have to evolve to that soon or risk dropping the Z biz altogether.