I love my Nokia N900 - and use it mainly as remote server control using SSH connection to my servers. N900 is a pocket computer WITH phone and not really just a phone. apps ... any application Debian Linux offers basically could be installed on a N900 as far as it makes sense for a mobile pocket computer.
Nokia 7110 - best style phone in recent times Nokia 6230i - best value for money all HTC models - best all-in-one
No doubt, that Nokia is World Leader in Mobile Phone Manufacturing but one thing is fact that in the near future Nokia'll get hard competition from company's like HTC, Sony, Motorola, Samsung, LG etc.