Originally Posted by dmapr
EDIT: On the second thought, I have flashed mine with porkupan's firmware and did not provide any text-alignment defaults in my userStyle.css, so it's quite possible that the stock firmware does indeed set the default to justify. Don't know what the latest versions of the hack specify as the default.
The default is definitely justified
on the standard 900 firmware. If you are using alternative firmware or the ePub has hardcoded CSS text alignment then it might display differently.