Nokia5800
Display Type: TFT touchscreen, 16M colors
Display Size: 360 x 640 pixels, 3.2 inches
Memory: MicroSD (TransFlash), up to 16GB
81 MB internal memory
OS: Symbian OS v9.4, Series 60 rel. 5
Camera: 3.2 megapixel
HTC Touch 3G
Display Type: TFT touchscreen, 65K colors
Display Size: 240 x 320 pixels, 2.8 inches
TouchFLO finger swipe navigation
Memory: MicroSD (TransFlash)
OS: Microsoft Windows
Camera: 3.2 megapixel
Samsung Omnia i900
Display Type: TFT touchscreen, 256K colors (65K effective)
Display Size: 240 x 400 pixels, 3.2 inches
Memory: microSD (TransFlash), up to 8GB,
OS: Microsoft Windows
Camera: 5 megapixel
Sony Ericsson Xperia X1
Display Type: TFT touchscreen, 65K colors
Display Size: 800 x 480 pixels, 3.0 inches
Full QWERTY keyboard
Memory: MicroSD support
OS: Microsoft Windows
Camera: 3.2 megapixel
Blackberry
Display Type: TFT touchscreen, 65K colors
Display Size: 360 x 480 pixels, 3.25 inches
Memory: MicroSD (TransFlash), microSDHC, up to 8 GB
1 GB storage memory
OS: BlackBerry OS
Camera: 3.2 megapixel
HTC Touch Diamond
Display Type: TFT touchscreen, 65K colors
Display Size: 480 x 640 pixels, 2.8 inches
TouchFLO 3D finger swipe navigation
Memory: 4 GB user available memory
No Card slot
OS: Microsoft Windows
Camera: 3.2 megapixel
Display Type: Touchscreen, 16M colors
Display Size: 320 x 480 pixels, 3.5 inches
Multi-touch input method
Memory: 8/16 GB shared memory
No Card slot
OS: Mac OS X v10.4.10
via : http://tos.logwire.com/2009/01/best-3g-touch-screen-mobile-phones-in.html
