Appena scritto sul forum XDA
"Custom ROMs to the ready, xda-developers has opened a forum for the Sony Ericsson Xperia X10 Android handset. This means at some point soon the phone will be rooted that will enable the adventurous amongst you to load custom ROMs without having to wait for SE to provide an official update.
Possible ROMs could include Android 2.1 and maybe even a port of HTC’s popular Sense UI"