I've installed RealVGA on my Samsung SGH-i780 and I really appreciate the extra real-estate. However, I've noticed several problems:
1) The onscreen keyboard is garbled
2) The icons to indicate in what mode the keyboard is (shift, numeric), are missing.
3) The Windows Mobile startup screen comes from a vga-device
4) Excel is not working anymore
Use Resco Keyboard (http://www.resco.net/pocketpc/keyboard/default.asp VGA skin, commercial SW) or pocketCM (www.pocketCM.com vga skin, freeware)