I so want to buy N900 but the things which is stopping me from buying in not its bulk not its power management, not pr1.2

But

The usefull app market which Android has and to top it up the great google service like gogles, speech recognition, searching facilities and other great technologies google will bring to the table with OS upgrades even in smaller inexpensive devices.

To top all this HTC sense UI combination with Googles Android makes it the easiest and most sought after device. DEsire is one product which benefits from this. Its leap feature, speech to text, maps, street view, etc are remarkable and most useful for the end consumer.

I know N900 can run many fullblown application but why would one want to run a fullblown application like open office there are many office applications

So i am Just wondering can N900 match Androids app market, googles ever new technologies and HTC's Sense UI which makes the phone more easy to use this, and anytime soon too.

Unlikely (the anytime soon part). The whole QT cross-compatibility with Symbian 3 and Meego devices will only hit full force once there's enough devices out there running Symbian 3 and Meego.

As for why would you want to run the fullblown application, sometimes the other applications don't have the full functionality you need.