Agree, I know there are other options i.e. Android, iPhone, WM 7. So what? I prefer something that is open and not waiting for someone to hack in order to do tethering or installing application. I prefer N900 since it allows me to do whatever I want it.

and of course the support of community, if you dont believe, you can put some questions about your problem in 900. within minutes, someone will answer you :-)