Also... True multitasking, tons of storage (32GB + MicroSD), accurate stylus input. But like sonnyp suggested, mostly that it was a full Debian-based Linux experience with a decent keyboard.

It wasn't perfect (I seem to remember the battery life wasn't great), but it was a great device, more like a Swiss army knife than a phone. Wish Nokia had done a full release of the N950 (the N9 with a hardware keyboard, only released to developers, with a weaker screen than the N9) as that was shaping up to be even better than the N900.

https://en.m.wikipedia.org/wiki/Nokia_N950