Android
SE said they're considering Android for XPERIA! ! ! ! !
http://www.boygeniusreport.com/2008/09/26/sony-erics ... »
http://www.sonyericsson.com/cws/products/mobilephone ... »
Its running windows but you could flash android on there with out to much issue.
Is it really that easy to just dump WinMo and put Android onto an Xperia, or HTC Touch Pro???
If it is easy (for you), heck, I don't know how to flash a device, and put a completly different OS on there.
It's not like you can just go to www.android.com, and click download, and WinMo is no longer on the devie.
Not sure if they will support the X1 but check out xda developers. They usually only deal with HTC devices but they might support the X1 since it will run windows.
The touch pro should defiantly be on xda when it comes out. Though it might take a little while after the G1 launches for people to tinker with the OS and port it to other devices.