Quick reply...
Why resistive? It's cheaper, it has better resolution, and it can work with a stylus. I can hardly find a device with smaller physical size of pixel in the display than N900.
The new firmware is a bugfix, and I'm glad that Nokia does fix some bugs.
How can you expect Nokia to introduce new features to Maemo, when they work on Symbian^, MeeGo, Harmattan, bug fixes, Qt, etc? Qt 4.7 gives good long-term perspectives for cross-platform applications running on Maemo.

How can you expect MeeGo on N900, if MeeGo isn't released to consumers yet? Only prototypes for daring developers. (And some people have already dual booted MeeGo and Maemo on N900)

And from day to day, I find N900 better and better. I have just mapped Home, End, Page Up and Down on the hardware keyboard.

I'm not going to get Android... Google, Gmail, Google Maps, Android, Google Chrome (browser and OS) look like omnipresent force. And it lacks customizability.
I'm using OpenStreetMap (it's actually far more detailed than Google Maps in some regions), Firefox, Maemo.

About mail: what would you say about Thunderbird? Firefox for mobile is here, why not Thunderbird? Somebody somewhen shall take care of that.
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Don't expect me to be objective. I use neither default N900's mail client nor Thunderbird nor any other mail client. I have never seen Android; I have had only a glance at Windows Mobile; I haven't seen a Blackberry. I'm not a power user, but I enjoy small and safe customizations through sudo gainroot, like LED patterns.
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Let the bye-bye be good. Let's hope shaad gets a device he likes, and the new owner of the N900 enjoys it.