We don’t seem to agree on much, but yes, integration is a good thing, generally. At this point, I’ve mostly made the transition away from my NZ90 to the point that I’m not carrying it around anymore. MP3 duties have passed to my iRiver (which is now always in my TR bag - so much for integration). My biggest beef so far with the P900 is that there isn’t nearly the breadth of software available for UIQ compared to Palm and there is virtually no freeware available.
One thing I haven’t heard mention of much with the P910 is to what extent there will be Blackberry software available. SE made a big announcement ages ago that they were licensing the tech from RIM. Maybe it has to do with the patent fights, but the inclusion of a QUERTY keyboard seems to make the phone tailor-made for BB.