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Yes they do. They just don't have flash 10 yet. (Though some with a Nexus One already got Froyo and therefore do have it.)

I have Froyo , and can confirm that the calender works fine on N1.

Hrmm... how do you switch between views since they're triggered by hover on the desktop? It might actually work better on a mobile device since the hover switching is actually annoying, and would have been much better implemented on click instead.

I am not sure I understand what you mean?

Is it possible to have a simple HTML version of an iPhone app or an iPad app?

Sure it is but but what is the point. I am pretty sure this is not made to be for everyone. Lowest common nominator obviously has it's merits. But let's not kill experimentation in the name of standards.