One enterprising XDA forum member has managed to snag a copy of the still unreleased Xperia Arc's /system partition via ADB, and has posted the resulting files online. The /system partition typically contains the core applications and files at the heart of any ROM.
As the Arc is powered by Android 2.3 Gingerbread, this system dump may help developers working on custom ROMs for the Xperia X8 and X10, both of which are stuck on Android 2.1 with no prospect of an official bump to Froyo or Gingerbread. For everyone else, there's always the prospect of grabbing a few cool wallpapers or ringtones. [XDA]