Sony Ericsson Xperia X1

Sony Ericsson C905

Features
Maemo 5, Yes, Yes, PowerVR SGX530 graphics, ARM Cortex A8 600 MHz, Yes, Yes, SMS (threaded view), IM, Push Email, Email
Microsoft Windows Mobile 6.1 Professional, Yes, Yes, Qualcomm MSM7200 chipset, 528 MHz ARM 11 processor, Yes, Yes, Yes, Email, MMS, IM, Push Email, SMS (threaded view)
Yes, Yes, Yes, Yes, Yes, Email, SMS (threaded view), IM, MMS
Memory
microSD, up to 16 GB, 256 MB RAM, 32 GB storage
MicroSD, 256 MB RAM, 512 MB ROM
Memory Stick Micro (M2), up to 8 GB, 2 GB or 8 GB card included, 160 MB
Display
TFT resistive touchscreen, 800 x 480 pixels, 3.5 inches, 65 K colors
TFT resistive touchscreen, 480 x 800 pixels, 3.0 inches, 65 K colors
TFT, 240 x 320 pixels, 2.4 inches, 256 K colors