Okay, thanks for your answers.
The more I read or see about the ipod touch the more I doubt that it is what I would like to have. The touch interface is great but I would feel a bit uncomfortable with iTunes, although it is said to be easy to use; it limits my flexibility if I only could share files with computers that have iTunes
So... what are comparable devices with more office features? I want a calendar, take notes/tasks, maybe music and a phone inside it is unecessary.