Currently looking out for these 3 phones.. Feedback and comments welcome May be buying one of them at the end of the year.. ( A sidenote: Are the apps on maemo.org and repositories free or payable ? )

Iphone 4

pros:

user friendly OS
Trendy ? lol debatable
huge app store
Brightest screen of all

cons:

Situational problems when syncing with itunes
Comparatively slower web browsing compared with Android and Maemo browsers
No flash support - Must use 3rd party app Frash ?
Cannot multitask properly - Only apps verified by apple are allowed
No FM radio support

HTC desire

pros:

User friendly OS coupled with HTC Sense
1ghz Snapdragon processor with integrated GPU

Cons:
Poor internal phone memory ( and all downloaded apps automatically stored there )
Must install 3rd-party app to transfer apps to MicroSD
Lack support for most video formats

Nokia N900

Pros:

Hacker friendly OS (Maemo).. albeit not as user-friendly ( for eg: dual boot OS )
Only phone that natively supports Flash
Active Maemo community
Dedicated GPU
Qwerty keyboard
Internet browsing as you see it on your computer
Vey excellent mutli-tasking capabilites

Cons:
Bulky
Resisitive touchscreen ? ( i dun mind it, but it may for some ppl ? )
Camera not up to standard despite 5MP
No MMS support ( only thru 3rd-party app )
Can only be bought thru Nokia store = very expensive =.=
Nokia may not give full support to Maemo platform in the long term
600 mHZ processor as compared to the above phones.. but able to be overclocked to 1.1 GHz.. at own risk though