I've yet to see any other "smartphone" do what the n900 can potentially do with running things like KDE and Debian (based off of what was possible with the n800/n810). Well besides the G1 which can also run Debian and OpenOffice. That's what makes it a real computer to me. Heck, theoretically you could even plug it into any TV (for a larger display), and use a bluetooth mouse and keyboard. That looks more computer than smartphone to me (but of course it's based on what the individual's use is).

I see two sides of a convergence battle with an eventual middle point. Though what that middle point will be, I have no idea. It may be a complete redefining of what computing will be seen as. As someone pointed out, there is a general movement towards cloud services (e.g Google Docs).

Edit: I guess an easy way to phrase it would be

Would adding cellular voice capability to any device that is decently portable (4 inch previous internet tablets, maybe even the MIDs we see out there around 7 inches) make it a smartphone or a computer? Or if you added a cellular radio to the internet tablets, would that make it a phone or just an internet tablet with cellular capability (more so for the mobile data rather than voice).

That's how I see the n900, just the new internet tablet with cellular capability (more so for the mobile data rather than voice). Though understandably not everyone thinks the same way.