For those of you who are wondering why the N900 belonging to 9000 (post #43) functions better than all ours N900 (e.g. can have custom ringtone for each caller), there is a simple explanation:
A person named 9000 is a new N900 user from Hong Kong. As it was reported, all new N900 currently in shops in Hong Kong have a new PR1.2 version software. His N900 obviously is one of them so some of the issues listed in this thread don't appear there.