After receiving a support e-mail enquiry about software running on a Palm 800w I realized I needed a way to test our software on a 320x320 resolution screen.
After some quick research I realized that the Windows Mobile Proefessional SDK already came with the appropriate emulator - its listed as "Windows Mobile 6 Professional Square QVGA".
But Also discovered Microsoft has released Windows Mobile 6.1 emulator images which adds
320x320, 240x400 & 240x440 resolution images for Windows Mobile Standard (which are all 131 DPI) and 480x800 and 240x400 images for Windows Mobile Professional. This should give you adequate emulators to test software for every currently available WM device on the market.
The 480x800 is the same resolution as the Toshiba G900 and the soon to be released Xperia X1.