Slightly larger screen (also bigger/heavier) but it's not an OLED screen = Fail.
Better camera for sure but only running Android 1.6 and hampered by Sony's UI.
Nexus wins.
One thing I've not considered is cost. How much is the Xperia?
Oh, while I'm at it. Nexus One does multi-touch now and gets Android updates before any other phone.
Nice try. X10 will be updated to Android 2.1 nearly immediately, though there is talk that its release is being held back, so that it comes loaded with Android 2.1, AND Adobe Flash 10.1.
hippy is always right. LOLs ;)