I'm still in loved with my N900 and there is no real successor, so I'm dreaming one.
First, take borrowed the camera from the N8 and its flash. Then crack open a Droid 3 and take the SoC.
The best of dreaming a new N900 for me is that I would always maintain the keyboard and the OS. As for the ones willing to run Android there will always be NITdorid.
It could look a cheap dream for many, but it would be a great tool for the everyday sysadmin.
techie regards,
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me