Well. I suppose there are a few advantages. But I would argue they are far too few and far between to warrant choosing an n900 over a modern phone.
You can easily buy fm transmitters for your car(which is where I assume you use it) that will connect to your samsung via bluetooth. I used one such and it worked great for my iPhone apart from the problems all fm transmitters have with stations creeping in on the same frequency.
And I don't know what you take pictures of but my n900 is decidedly sub-par compared to modern day phones. With and abundance of noise and weird colors creeping in on my photos especially indoors.