I have two Nokia phones and both cause me a problem. I can't use them properly without wearing my spectacles. And I don't like to wear my spectacles all the time so I often end up using the menus by memory. The set-up has some options to change font sizes, but nothing that makes the whole interface bigger.

If the n900 has the capability to have a large-font interface, making it suitable for those of us with bad eyesight, I'll fight my way to the front of the queue.

(I've never checked if this facility exists on any smartphones, so may be being dumb here.)