Well I’m more than happy with my P900. I’ve had it since christmas and can’t imagine going back to my T610 now.
Although I don’t really use the calendar function at the moment I have played and I get everything to sync with Outlook (contacts, emails, calendar etc) really easily.
I also use it as an ebook reader and an MP3 player which is great as it means you’re never without something to do (especially when it takes 40mins on the bus to uni everyday) I laugh at my housemate when he complains his book is so heavy and I just whip out my phone
When I bought the P900 I almost got an ipod instead but like you decided that by the time you’ve got an ipod, phone, camera and wallet to carry around it just gets too much. While the camera isn’t that great, it’s fine for just fun pics everyonce in a while!!
I’ve even found a program which will re-encode divxs for viewing on the P900. While it can be a little jerky it’s another way to pass the time. Many lunch break has been filled watching dragonball Z!!
My one piece of advice would be that if you plan on using it as an MP3 player or for watching videos you really need a 128MB Duo. It can seem a hastle to only have a few albums on you but by using a usb 2 card reader you can transfers new stuff in minutes so it’s not that bad.
Any other questions just ask away (but buy one anyways 8) )