Nice thread.

Number 1: by a wide margin is video out. Something like the mini-dvi socket apple use should fit OK. Ideally, this might have higher res than the primary screen (640*480 would be good enough for my purposes). It's probably the only thing that's going to persuade me to trade up to the N900.

Number 2: more ram - ideally enough to run OpenOffice (quick check on a mac shows it running with < 100MB resident memory, though the virtual size is around 500MB; expanding the ram to 256MB, and fixing the problems that limit swap space size to the same size as real memory, would presumably make it runnable, even if slow).

Number 3: proper PIM support - gpe is OK, but somewhat buggy:
.poor integration with alarms (though it seems to work a little better with diablo)
.limited sync options (I use erminig, but that is limited by the options that google calendar supports)
I'm guessing the "internet tablet is not a PIM" refrain from Nokia was a marketing strategy to differentiate it; but this battle has been won, both by the internet tablet, and by the iphone: no-one is likely to think of the tablet as "just another PIM" now. But there still is a demand for PIM support. A small investment by Nokia (I imagine a couple months work by someone who knows the maemo architecture inside out) would get gpe/opensync working well.

Things I don't want:
keyboard slider - when I want a keyboard, it's much more convenient to use a full-size bt keyboard.

Cheers
Bob